Realize that the *tilt* of the Earth with respect to the Sun (23-1/2 degrees) isn't changing; only the *direction* the Earth's axis points toward changes. So precession doesn't really change the climate by itself. What *does* happen, though, is that the seasons change position in the Earth's orbit.
Right now, the northern hemisphere has winter when the Earth is closest to the Sun (and the southern hemisphere has summer). In 13,000 years (half of the precession period) ... (cont)
(cont) ... that situation will reverse. Since the Earth moves more quickly in its orbit when it is close, the southern hemisphere will wind up with less summertime heating while the northern hemisphere gets more. But since the northern hemisphere has most of the land, that change of heat balance will have some effect on climate.
@ambuj1991 Yes, although of course the seasons gradually shift to different times of year rather than simply switching - by about 1 day every 72 years (26,000 / 365, give or take!)
Look at the Solstice article on Wikipedia, under 'Heliocentric view of the seasons'.
These Videos are amazing, Thank you so much for the effort in making them. I already love physics but these are great videos to share with my friends who find things not so intriguing.. but from videos like these i love how they bring them up in conversation before i do :) Thanks again :)
Love it, thanks for putting this together! I've heard axial precession mentioned as a side note, but usually we stick to "just the facts, ma'am" because
1. it's a slightly technical point
2. context could be gravity, or the solar system, or Polaris, so axial precession usually doesn't take center stage
3. It's kind of hard to understand. Like prof said, there's lots of little bits flying around and it's kind of complicated. Plus, look at that insane gyroscope! Very unexpected for me.
@AlexIsSmalll Not such big of a deal... It's slightly less round than a billiard ball, so no great loss (unless your job actually involves earth measurement).
@lpasepok No. It was led by Maupertius who was a bit premature in announcing that Newton was correct and Descartes was wrong. Maupertius became a French national hero because he went so for North and did experiments in terrible conditions.
I sincerely wish more educational shows were like this. They always seem to stifle the actual science content in favor of being "entertaining"- not realizing talented people can make science entertaining without compromising content. :) Thanks so much for all the videos!
hey brady, do you ask some of those questions for the sake of your audience or do you just get into it so much that you end up asking for your own curiosity?
So would this have an effect on when seasons happened within the year? If the axis processes and seasons are caused by the position of the axis wouldn't this cause the seasons to very slowly alter. Does this happen? It would be too slow to notice on a personal time scale, but would it affect dating of history?
@arife06 He said it took 26000 years for the earth to precess one lap. Lets guess he means astronomical years, time for the earth to orbit around the sun relative to the stars.
Then as many as 26001 tropical years would have elapsed. In tropical years the seasons are always at the same time since tropical years are determined by the sun relative position to the horizon. The sun would be highest at midsummer and lowest at midwinter for example.
Please make more videos. They are short and a little bit nerdy (it's physics after all), but contain so much useful information about the world. Thank you for your effort!
Very informative. I know that the effect of precession is very small on the human time scale but I wonder how it affects the precession of high accuracy GPS readings. Since the surface of the earth would basically be slipping one way or another at a nearly 90 degree angle to the normal rotation of the earth. I guess the whole system could be calibrated and automatically adjusted to the magnetic poles. Cool stuff.
i dont think the precession has any effect on the exact positioning of a gps satellite even if the precession would be way faster, say one circle in 1 month, because the satellites are bound to earths gravity so they always move with the planet. after all they are not left behind by earth on its orbit around the sun ...
@BurtonRGA7 True they are bound to the earth by gravity in relation to elevation but the force of rotation of a celestial body is not transmitted via gravitational waves, those remain relatively constant at a distance even if the object is rotating. By that logic the normal 24hr rotation of the earth would speed satellites up and not require you to accelerate an object to 7.5 km/s to keep it in orbit, the earth would do it for you.
@BurtonRGA7 And if the earth spun as fast as the sun did on its axis our year would only be 25-35 days long. Or our years would get consecutively shorter as the sun tried to accelerate us to match it axial rotation speed.
after watching ,,,i quite suddenly thought ...'were the Ice ages a global phenomenon?' ...in other words when one (ice age) happened 'did ice cover the entire planet?' ...is there a definitive answer?
even in the 'Snow Ball' accounts there seems to be a number of assertions that the evidence occurs globally still there is the question as to where the plates were located in relation to each other
thank-you for sharing this information ...some of the comment inspired by this video are remarkable
@BurtonRGA7 I'm thinking you mean 'signs' ...interesting ...yes? ...how easy it is to mix up our most elemental concepts ...if we can be generous with our thinking about mix-ups then it is possible that we can eliminate words like "crap" from our thinking
If the speaker had elaborated on nutation he could have mentioned that the earth has to be oblate (fatter at the equator than at the poles) to spin as it does. All of the water in the oceans and the magna inside the earth dissipate energy to keep the motion stable. So, if somehow enough mass could move from the equator to the poles the earth would "flip over" and spin about an axis through the equator. The resulting climate change would likely kill most life on earth.
i want one of those globe brilliant i thought and this explains the moon been vertical rather than horizontal when changing well at least in my location .
The chief effect of precession as viewed from Earth is that the north celestial pole moves away from Polaris as the pole star. In fact, Vega was once the pole star. In 2026 (I think) the pole will be at its closest approach to Polaris, and afterwards will begin moving away from it. Obviously, the same thing happens to the south pole as well.
@underwood154: They are in freefall, but that doesn't negate the fact that all the galaxies in the universe are mutually gravitationally attracted to one another. The fact that gravity propagates at the speed of light complicates things at the galactic scale, and then of course there is the effects of black matter, which is thought to be gravitational in nature, and black energy, which isn't. The total effect is that the matter is attracted into globs and threads, leaving empty voids.
So the melting ice of the poles, and the resultant water moving to the equator region, would enhance the effect even more, causing the polar regions to get even longer sunlight through the year, which melts even more ice and so on.
How long would you figure it would take for a great tilt, and plate shift to occur.
I know that there are stones found in Petoski, MI, USA that suggest that that region was once a tropic region. These stones are called Petoski stones and are fosselized coral.
@Stormrunner0002: The world's oblateness is in balance; it can't permanently change. It might be that warmth will cause a change in that balance, but the Earth will compensate over long times by changing shape as required. Isostatic rebound, the effect that ice on continents melting away allows the ground to rise, is part of that process. The bulge will remain, as long as the Earth rotates. The sea level at the equator is about 21 km higher than it is at the poles.
@MrDeanage Notice that he said it would take several thousands of years (I'm not sure if it was 8.000 or 23.000), it doesn't change in one year. If it did, then yes one side of the earth would always be in sunlight OR the days/nights would last half as long incase it spinned in the other direction.
But yeah it would be interesting to know if this actually caused a switch of seasons.
@mcchuff Yes---but I had to look up Milankovitch on Google. The real reason why I did the video was that George showed me the gyroscope used in the video and I realised that I could demonstrate how a torque causes axial precession. If you have any other suggestions please write to me.
@deeXaeed: No. Precession doesn't change the amount or angle of received sunlight at any point on the planet; it has a very small effect upon our timekeeping and the utility of a pole star like Polaris, but no climate effect. There are 3 other cycles, called the Milankovitch cycles, which do influence the reception of sunlight; one of them is closely related to precession; it is the exact angle of the precession (called obliquity), which can slowly change over time between 22.1 and 24.5 degrees
It has come to my attention that I am wrong (!!) Precession itself does have an effect on climate, though it is mild compared to the "big three". What happens is that when the pole is tilted toward or away from the sun, the seasons are more extreme (hotter summers, colder winters) that they are between those states.
@sonic003573 I don't actually know the answer but I have a rough idea, so anybody correct me if I'm wrong. But I think its something to do with the earth spinning at a constant speed, its the same when your in a car travelling at a constant speed, you can't feel your moving forward, you can only see it.
@sonic003573 "Why cant we feel the earth spinning?"
What would you expect to feel? Serious question.
This was actually a standard SAT question in a primary school near me and the answer given to the teachers was "because it is so big". At work, after discussing it with half a dozen or so engineers for about 20 minutes the only thing we were sure of was that the answer wasn't "because it is so big". Mostly we were trying to figure out what the questioner thought they "should" be feeling.
@sonic003573 "im not sure just the feel of motion "
What is that like? I really can't imagine.what you expect it to feel.
Constant linear motion feels identical to being stationary. If you are in, say, a car you get jiggled around by bends and bumps but obviously the Earth's motion is smooth. Any centrifugal force due to the curved path manifests as a constant (tiny) reduction in weight, so you have nothing to compare it to. Do you expect to feel the wind in your face? Genuinely perplexed.
does the earth inherit its non spherical shape due to its spinning or did it develop it from some other source? that is to say if the earth did stop spinning would it be a perfect sphere?
I love that each of your videos gives me a little bit more knowledge in understanding our universe. Thank you for putting an effort into making these videos. Too bad not to many people are looking into this kind of stuff. Again I thank you!
@puncheex many are just looking into lady gaga and gangsta rap. Subscribers:
40,281 to sixty symbols. Subscribers:
807,567 to meekakitty (and she is not something as commercial as rihanna or any other star)... hmmm... Just an example. Don't get me wrong. Singing is art. But slow minds tend to move away from sixty symbols' kind of vids/info.
@deadmansouls: All right, you (and perhaps he) are referencing the video itself, not the topic of the video. OK, his remark suddenly makes sense. Thanks for the mind-wrench - I needed that.
I have to say.... Im SO SO SO happy to still be seeing "MrOldProf" at the start, making a cameo. Happy retirement MrOldProf; you have become my fav on SixtySymbols and Im glad you are still helping with Brady's project and keeping us crazy interwebz characters happy, entertained and edu-ma-cated! :) Best Regards, J :)
@puncheex That's the one I was thinking of. How the degree of the axis changes in a cycle over so many years. Thought that was what the video was about(didn't really watch it lol).
@puncheex Yearly average, not 10,000 yearly average. Give me a break. I'm talking lifespan terms dude. No need to jump down my throat over what you(the grinch) and I feel is relevant in terms of "average temperature."
@12gaugebleachdrinker: I jumped down your throat? Not likely, with all that bleach down there.
The change in climate due to precession is not anything noticeable within a lifespan. The cyclic effect goes from the mild season to the extreme season in 6500 years. It likely would take a trained scientist to detect it at the extremes.
@12gaugebleachdrinker I didn't know I needed one? It's a common argument that "centrifugal force" doesn't really exist, whereas "centripetal" does. Feel free to wikipedia that if you need. :)
@johnizzle725 Potato/Patato. And I know what you meant. It's just terms dude. You must have had an overzealous science teacher who felt jaded on that subject at some point in his life.
@McC1oudv2 Yes and no... nobody would likely notice a difference, but technically season conditions which exist for the earth while it's on one side of the sun, would become reversed.
@McC1oudv2 I wouldn't say that they shift, there is a slightly change on the axis degrees, that graphic is just illustrative, not enough to shift them. But yes, probably there's some kind of temperature change, Just an opinion. :)
No, the seasons won't shift, because our calendar is based on a tropical year, which is defined as the time from vernal equinox to vernal equinox, and this takes precession into account. By contrast, a sidereal year is the time taken by the Earth to orbit the Sun once with respect to the fixed stars. Google "tropical year" and "sidereal year".
I disliked this video because you completely overlooked that ancient civilizations from over 10,000 years ago have been measuring the procession of the equanoxes and building HUGE structures like the pyramids with measurements that would NEED to have knowledge of that 26,000 years cycle and the procession of the ages. Look at ANY ancient civilization past 10,000 years old like the Olmecs before the Maya or the indian civilizations that spawned the vedic texts. LRN2RESEARCH
@RAV3xBinG3 I don't know of a single ancient building related to the PRECESSION of the equinoxes. There are of course many related to solstices (the shortest and longest day of the year) and there may be some related to equinoxes (the days that have the same length than their nights). However, I doubt there may be too many buildings related to the precession of the equinoxes. Being a cycle of 26000 years, I doubt many ancient civs would have understood it, really.
Does this mean that the 'greenhouse effect' is complete junk and it is in fact a result of a perfectly natural event in the earths rotational axis
If so then i'm no longer gonna feel guilty when i have a cigarette or run my car needlesly
voiceofreason2008 2 days ago
so does that mean that the seasons gonna change, so that winter is in june?
NWEGary001 4 days ago
6:29 A physicist using the phrase "centrifugal forces"?
weurRTG 6 days ago in playlist Uploaded videos
Great Video. Where could I buy a rotating/ hovering globe like the one in this video?
whoistavo 3 weeks ago
Clever dicks those greeks
cheers
nedladdy 3 weeks ago
Comment removed
wilsonspalding 1 month ago
i laugh every time i watch one of your videos because of the atlas of creation...
jacobpaprotskiy 1 month ago
awwww he completely missed lappand by atleast an inch there =,(
Storhonta 1 month ago
Am I the only one who thought of dubstep after reading the title?
AudioJustG 1 month ago
What effect does axial precesion have on global climate? Seems to me it would change the quantity of solar heating on the poles.
jerryoven 1 month ago
@jerryoven
Realize that the *tilt* of the Earth with respect to the Sun (23-1/2 degrees) isn't changing; only the *direction* the Earth's axis points toward changes. So precession doesn't really change the climate by itself. What *does* happen, though, is that the seasons change position in the Earth's orbit.
Right now, the northern hemisphere has winter when the Earth is closest to the Sun (and the southern hemisphere has summer). In 13,000 years (half of the precession period) ... (cont)
pseudorandomly 1 month ago
@pseudorandomly
(cont) ... that situation will reverse. Since the Earth moves more quickly in its orbit when it is close, the southern hemisphere will wind up with less summertime heating while the northern hemisphere gets more. But since the northern hemisphere has most of the land, that change of heat balance will have some effect on climate.
pseudorandomly 1 month ago
Sure is nice to have a bunch of smart, well educated folks around to explain these complicated to us.
StereoSpace 1 month ago
Deez niggas is smart yo
jakegibson 2 months ago
The Geodesic Mission did not take place in Peru, but in Ecuador...
daweedcito 2 months ago
Holy crap, pre-AD thinkers were clever as fuck.
inthenameofnine 3 months ago
Comment removed
salrun07 3 months ago
so..would that mean that every 13000 years the circle of seasons invert in the northern and southern hemispheres..?
ambuj1991 4 months ago
@ambuj1991 Yes, although of course the seasons gradually shift to different times of year rather than simply switching - by about 1 day every 72 years (26,000 / 365, give or take!)
Look at the Solstice article on Wikipedia, under 'Heliocentric view of the seasons'.
LJHaywood 2 months ago
oooOOOH! Sneaky way to program my mind with your hypno-spirals, SCIENCE-SATAN.
esdjiraan 4 months ago
Newton 1 Descartes 0.
movement26 5 months ago
thanks : )
187Ady187 5 months ago
very interesting!
LOOPWHOLEBEATS 5 months ago
my physics teacher called it angular momentum
colossalko 5 months ago
how does that earth thing work... i mean how does the stand hold it up?
photonman54 5 months ago
@photonman54 I'm thinking magnets
lileclipse2 5 months ago
@photonman54 Magnets for sure.. nothing else comes to mind
klesstwo 4 months ago
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is this why the world is going to end in 2012?
5pecular 6 months ago
This reminds me of why I love Physics and why I currently doing a course in Geomatics (Survey, Cartography and Remote Sensing of the Earth etc).
sm0kingJay 6 months ago
OMG What is that levitating earth device called?
I really want one :D
SuperCorey95 6 months ago
@SuperCorey95 Its called a levitating Globe or levitating Earth, you can buy them on amazon!
queeniekaz 6 months ago
So with something like a Powerball, are you basically pushing against the axial progression and reversing the process??
mickenoss 6 months ago
A little off topic, i would love if you could tell me the maker of that levitating globe. I really want to buy it. Thanks!
aneeshkotru 6 months ago
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These Videos are amazing, Thank you so much for the effort in making them. I already love physics but these are great videos to share with my friends who find things not so intriguing.. but from videos like these i love how they bring them up in conversation before i do :) Thanks again :)
moonedisking 6 months ago
Comment removed
moonedisking 6 months ago
Who in the world would give this a Dislike?
CrudOMatic 6 months ago
Guys this is sooo good. I have a extra lesson through you guys, making me smarter in my class!
Thank you guys for exciting me! You make physics so interesting
xEquals3x 6 months ago
Love it, thanks for putting this together! I've heard axial precession mentioned as a side note, but usually we stick to "just the facts, ma'am" because
1. it's a slightly technical point
2. context could be gravity, or the solar system, or Polaris, so axial precession usually doesn't take center stage
3. It's kind of hard to understand. Like prof said, there's lots of little bits flying around and it's kind of complicated. Plus, look at that insane gyroscope! Very unexpected for me.
heyandy889 6 months ago
They lied in school! The earth isn't flat OR round!
AlexIsSmalll 6 months ago 2
@AlexIsSmalll Not such big of a deal... It's slightly less round than a billiard ball, so no great loss (unless your job actually involves earth measurement).
loupax 6 months ago
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AlexIsSmalll 6 months ago
Yet more proof that astrology is hogwash. Science rules!
johnclavis 6 months ago
Do you know if perhaps Carl Linnaeus had something to do with the whole Lappland thing?
I'm just guessing and all but that would sound reasonable considering the fact that he did go up there.
lpasepok 6 months ago
@lpasepok No. It was led by Maupertius who was a bit premature in announcing that Newton was correct and Descartes was wrong. Maupertius became a French national hero because he went so for North and did experiments in terrible conditions.
MrOldprof 6 months ago
@MrOldprof
Yeah, pretty much assumed that I was wrong in the beginning but it would've been cool if my guess was correct.
Thanks anyway :).
lpasepok 6 months ago
I shat bricks @ 1:14
j0hnp4u1 6 months ago 2
That is sooooo coool!
awesomejoe12 6 months ago
I sincerely wish more educational shows were like this. They always seem to stifle the actual science content in favor of being "entertaining"- not realizing talented people can make science entertaining without compromising content. :) Thanks so much for all the videos!
whatsarobut 6 months ago
@whatsarobut you're welcome... thanks for the nice comment!
sixtysymbols 6 months ago
hey brady, do you ask some of those questions for the sake of your audience or do you just get into it so much that you end up asking for your own curiosity?
wvb93 6 months ago 10
@wvb93 a bit of both I think...
sixtysymbols 6 months ago 15
Show me the math please! =)
DivergentMind 6 months ago
very cool video! could you also make one about what happens when the north and south pole switch... :)
Gta2CubanPete 6 months ago
I wonder, does axial procession have any effects on climate on the earth in general or in specific areas of the earth?
Kurtlane 6 months ago
cool story bro
TraXXXtar 6 months ago
So would this have an effect on when seasons happened within the year? If the axis processes and seasons are caused by the position of the axis wouldn't this cause the seasons to very slowly alter. Does this happen? It would be too slow to notice on a personal time scale, but would it affect dating of history?
arife06 6 months ago
@arife06 He said it took 26000 years for the earth to precess one lap. Lets guess he means astronomical years, time for the earth to orbit around the sun relative to the stars.
Then as many as 26001 tropical years would have elapsed. In tropical years the seasons are always at the same time since tropical years are determined by the sun relative position to the horizon. The sun would be highest at midsummer and lowest at midwinter for example.
Calendars are usually based on tropical years.
busanoarmy 6 months ago
@busanoarmy Ok I thought he said 2600 years not 26000. That clears things up a bit.
arife06 6 months ago
Please make more videos. They are short and a little bit nerdy (it's physics after all), but contain so much useful information about the world. Thank you for your effort!
mrh3h 6 months ago 13
@mrh3h we've got more coming
sixtysymbols 6 months ago 9
Very informative. I know that the effect of precession is very small on the human time scale but I wonder how it affects the precession of high accuracy GPS readings. Since the surface of the earth would basically be slipping one way or another at a nearly 90 degree angle to the normal rotation of the earth. I guess the whole system could be calibrated and automatically adjusted to the magnetic poles. Cool stuff.
josh2utube 6 months ago
@josh2utube
i dont think the precession has any effect on the exact positioning of a gps satellite even if the precession would be way faster, say one circle in 1 month, because the satellites are bound to earths gravity so they always move with the planet. after all they are not left behind by earth on its orbit around the sun ...
BurtonRGA7 6 months ago
@BurtonRGA7 True they are bound to the earth by gravity in relation to elevation but the force of rotation of a celestial body is not transmitted via gravitational waves, those remain relatively constant at a distance even if the object is rotating. By that logic the normal 24hr rotation of the earth would speed satellites up and not require you to accelerate an object to 7.5 km/s to keep it in orbit, the earth would do it for you.
josh2utube 6 months ago
@BurtonRGA7 And if the earth spun as fast as the sun did on its axis our year would only be 25-35 days long. Or our years would get consecutively shorter as the sun tried to accelerate us to match it axial rotation speed.
josh2utube 6 months ago
after watching ,,,i quite suddenly thought ...'were the Ice ages a global phenomenon?' ...in other words when one (ice age) happened 'did ice cover the entire planet?' ...is there a definitive answer?
even in the 'Snow Ball' accounts there seems to be a number of assertions that the evidence occurs globally still there is the question as to where the plates were located in relation to each other
thank-you for sharing this information ...some of the comment inspired by this video are remarkable
gaiagale 6 months ago
what is the globe sitting in in this??
1KevinsFamousChili1 6 months ago
I love sixty symbols. I should have done physics!
davedupplaw 6 months ago 22
@davedupplaw it's never too late!
sixtysymbols 6 months ago 22
@davedupplaw now i am 10 times better even though we don't take physics at school!
EducationLover 6 months ago
does that mean that in 26 000 years summer and winter will be switched (january hot and july cold) :)
KillaKingStyle 6 months ago
@KillaKingStyle
no, our calender takes care of that effect so the summer will always be in july :)
but what changes, is the position of the sun relative to the background stars.
so the whole thing about astrology is crap because the zodiacal sings change over time...
BurtonRGA7 6 months ago
@BurtonRGA7 I'm thinking you mean 'signs' ...interesting ...yes? ...how easy it is to mix up our most elemental concepts ...if we can be generous with our thinking about mix-ups then it is possible that we can eliminate words like "crap" from our thinking
just a thought ;-])
gaiagale 6 months ago
@gaiagale
erm... ok
that was a typo, so what's the deal?
BurtonRGA7 6 months ago
@BurtonRGA7 ;-])
gaiagale 6 months ago
If the speaker had elaborated on nutation he could have mentioned that the earth has to be oblate (fatter at the equator than at the poles) to spin as it does. All of the water in the oceans and the magna inside the earth dissipate energy to keep the motion stable. So, if somehow enough mass could move from the equator to the poles the earth would "flip over" and spin about an axis through the equator. The resulting climate change would likely kill most life on earth.
MrRocketjon 6 months ago
YES!
bkjbs762 6 months ago
com'on nibiru!
supermassvanity 6 months ago
Great video!
coolliger 6 months ago
i want one of those globe brilliant i thought and this explains the moon been vertical rather than horizontal when changing well at least in my location .
takeoUup115 6 months ago
The chief effect of precession as viewed from Earth is that the north celestial pole moves away from Polaris as the pole star. In fact, Vega was once the pole star. In 2026 (I think) the pole will be at its closest approach to Polaris, and afterwards will begin moving away from it. Obviously, the same thing happens to the south pole as well.
puncheex 6 months ago
What force holds our galaxies in its point in space or are we in free fall spin out ? Just wondering.......
underwood154 6 months ago
@underwood154: They are in freefall, but that doesn't negate the fact that all the galaxies in the universe are mutually gravitationally attracted to one another. The fact that gravity propagates at the speed of light complicates things at the galactic scale, and then of course there is the effects of black matter, which is thought to be gravitational in nature, and black energy, which isn't. The total effect is that the matter is attracted into globs and threads, leaving empty voids.
puncheex 6 months ago
So the melting ice of the poles, and the resultant water moving to the equator region, would enhance the effect even more, causing the polar regions to get even longer sunlight through the year, which melts even more ice and so on.
How long would you figure it would take for a great tilt, and plate shift to occur.
I know that there are stones found in Petoski, MI, USA that suggest that that region was once a tropic region. These stones are called Petoski stones and are fosselized coral.
Stormrunner0002 6 months ago
@Stormrunner0002: The world's oblateness is in balance; it can't permanently change. It might be that warmth will cause a change in that balance, but the Earth will compensate over long times by changing shape as required. Isostatic rebound, the effect that ice on continents melting away allows the ground to rise, is part of that process. The bulge will remain, as long as the Earth rotates. The sea level at the equator is about 21 km higher than it is at the poles.
puncheex 6 months ago
26.000*
ZiqqiPH 6 months ago
This has been flagged as spam show
THAT FLOATING EARTH IS THE COOLEST THING EVER
ThePost1994 6 months ago
sopwith camel
twistedbass15 6 months ago
But doesn't this mean that one part of the earth will always be in sunlight?
MrDeanage 6 months ago
@MrDeanage Notice that he said it would take several thousands of years (I'm not sure if it was 8.000 or 23.000), it doesn't change in one year. If it did, then yes one side of the earth would always be in sunlight OR the days/nights would last half as long incase it spinned in the other direction.
But yeah it would be interesting to know if this actually caused a switch of seasons.
ZiqqiPH 6 months ago
Look into the camera, pleeeease!
HubertCumberdale22 6 months ago
@HubertCumberdale22 Who: me(roger Bowley) or Mike Merrifield?
MrOldprof 6 months ago
I posted a request for a Milankovitch cycle video months ago...I wonder if this video was partly due to my request :D.
mcchuff 6 months ago
@mcchuff Yes---but I had to look up Milankovitch on Google. The real reason why I did the video was that George showed me the gyroscope used in the video and I realised that I could demonstrate how a torque causes axial precession. If you have any other suggestions please write to me.
MrOldprof 6 months ago
will the climate of places change because of axial precession?
deeXaeed 6 months ago
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@deeXaeed: No. Precession doesn't change the amount or angle of received sunlight at any point on the planet; it has a very small effect upon our timekeeping and the utility of a pole star like Polaris, but no climate effect. There are 3 other cycles, called the Milankovitch cycles, which do influence the reception of sunlight; one of them is closely related to precession; it is the exact angle of the precession (called obliquity), which can slowly change over time between 22.1 and 24.5 degrees
puncheex 6 months ago
It has come to my attention that I am wrong (!!) Precession itself does have an effect on climate, though it is mild compared to the "big three". What happens is that when the pole is tilted toward or away from the sun, the seasons are more extreme (hotter summers, colder winters) that they are between those states.
puncheex 6 months ago
i live in lappland, sweden :)
clarkcolt45 6 months ago
Interesting
iapmd 6 months ago
do galaxies have this processional activity?
Pianoguy32 6 months ago
@Pianoguy32: In order to show precession the spinning body must be one solid piece. In a galaxy, some parts may have a precession, some may not.
puncheex 6 months ago
Why cant we feel the earth spinning ?
sonic003573 6 months ago
@sonic003573 I don't actually know the answer but I have a rough idea, so anybody correct me if I'm wrong. But I think its something to do with the earth spinning at a constant speed, its the same when your in a car travelling at a constant speed, you can't feel your moving forward, you can only see it.
mrrig91 6 months ago
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@sonic003573
"Why cant we feel the earth spinning?"
Because of your speed relative to the surface of the earth.
KemaTheAtheist 6 months ago
@sonic003573 "Why cant we feel the earth spinning?"
What would you expect to feel? Serious question.
This was actually a standard SAT question in a primary school near me and the answer given to the teachers was "because it is so big". At work, after discussing it with half a dozen or so engineers for about 20 minutes the only thing we were sure of was that the answer wasn't "because it is so big". Mostly we were trying to figure out what the questioner thought they "should" be feeling.
chrisofnottingham 6 months ago
@chrisofnottingham im not sure just the feel of motion that all
sonic003573 6 months ago
@sonic003573 "im not sure just the feel of motion "
What is that like? I really can't imagine.what you expect it to feel.
Constant linear motion feels identical to being stationary. If you are in, say, a car you get jiggled around by bends and bumps but obviously the Earth's motion is smooth. Any centrifugal force due to the curved path manifests as a constant (tiny) reduction in weight, so you have nothing to compare it to. Do you expect to feel the wind in your face? Genuinely perplexed.
chrisofnottingham 6 months ago
@chrisofnottingham i think you are right so it don't matter if we were travelling at the speed of light It would feel the same as if we were still..
sonic003573 6 months ago
I'm sitting about 5 kilometers from where the French expedition went to check for the flatness in Lappland.
MegaYippie 6 months ago
Don't stop making these videos, they are extremly interesting.
MagicUserC 6 months ago 38
After reading Descarte's Meditations I find it hard to take anything he says seriously.
scrustle 6 months ago
does the earth inherit its non spherical shape due to its spinning or did it develop it from some other source? that is to say if the earth did stop spinning would it be a perfect sphere?
jeffhx 6 months ago
i want that floating globe...
loserofnothing 6 months ago
@loserofnothing me too
Kasscne 6 months ago
I LOVE your videos and this one is particularly awesome ^__^
BrotherBloat 6 months ago
I want a floating earth thing.
ItsMeFletcher 6 months ago
strange, he refered to the moon as a planet...is it technically a planet? or more likely just a mistake?
ice7771 6 months ago
0:05 OMG MALAYSIA! That's where I am :D
Khaielaash94 6 months ago
How does this wobbling work on uranus wich is tilted almost 90 degrees?
Dextomus 6 months ago
@Dextomus: Yes. It precesses; the point on the celestial sphere that its north pole points to moves because of gyroscopic motion and forces.
puncheex 6 months ago
A former professor acknowledged the simplification in a rotating reference frame of centrifugal force! Yay!
axelasdf 6 months ago
@axelasdf
I'll have you know I am still a Professor---until 1 September when I become an Emerits Professor.
MrOldprof 6 months ago
@MrOldprof
I do apologize. When I saw the video about clearing out your office, I made the wrong assumption. Thank you .
axelasdf 6 months ago
You ever wonder how they make satellites change their aim in space? This works.
axelasdf 6 months ago
I love that each of your videos gives me a little bit more knowledge in understanding our universe. Thank you for putting an effort into making these videos. Too bad not to many people are looking into this kind of stuff. Again I thank you!
deadmansouls 6 months ago 42
@deadmansouls: Who's not looking into it? Don't say that to anyone working in aerospace!!
puncheex 6 months ago
@puncheex many are just looking into lady gaga and gangsta rap. Subscribers:
40,281 to sixty symbols. Subscribers:
807,567 to meekakitty (and she is not something as commercial as rihanna or any other star)... hmmm... Just an example. Don't get me wrong. Singing is art. But slow minds tend to move away from sixty symbols' kind of vids/info.
deadmansouls 6 months ago
@deadmansouls: All right, you (and perhaps he) are referencing the video itself, not the topic of the video. OK, his remark suddenly makes sense. Thanks for the mind-wrench - I needed that.
puncheex 6 months ago
Good explanation especially using the gyro!
I have to say.... Im SO SO SO happy to still be seeing "MrOldProf" at the start, making a cameo. Happy retirement MrOldProf; you have become my fav on SixtySymbols and Im glad you are still helping with Brady's project and keeping us crazy interwebz characters happy, entertained and edu-ma-cated! :) Best Regards, J :)
jeebersjumpincryst 6 months ago 2
Isn't there some correlation between the axis wobble and the changes in average earth temperature?
12gaugebleachdrinker 6 months ago
Comment removed
puncheex 6 months ago
@puncheex That's the one I was thinking of. How the degree of the axis changes in a cycle over so many years. Thought that was what the video was about(didn't really watch it lol).
12gaugebleachdrinker 6 months ago
@12gaugebleachdrinker: No. The average doesn't change; the seasons get more extreme when the axis gets close to the axis of the sun.
puncheex 6 months ago
@puncheex Yearly average, not 10,000 yearly average. Give me a break. I'm talking lifespan terms dude. No need to jump down my throat over what you(the grinch) and I feel is relevant in terms of "average temperature."
12gaugebleachdrinker 6 months ago
@12gaugebleachdrinker: I jumped down your throat? Not likely, with all that bleach down there.
The change in climate due to precession is not anything noticeable within a lifespan. The cyclic effect goes from the mild season to the extreme season in 6500 years. It likely would take a trained scientist to detect it at the extremes.
puncheex 6 months ago
@puncheex You could use to drink some bleach. Or wash your eyes with it.
12gaugebleachdrinker 6 months ago
anyone else notice the two video responses combine into one image? COMBO
me835 6 months ago
6:30 ...but there's no such thing as centrifugal force! (Let the nerdy flame wars begin :D )
johnizzle725 6 months ago
@johnizzle725 Where's your video explaining your comment?
12gaugebleachdrinker 6 months ago
@12gaugebleachdrinker I didn't know I needed one? It's a common argument that "centrifugal force" doesn't really exist, whereas "centripetal" does. Feel free to wikipedia that if you need. :)
johnizzle725 6 months ago
@johnizzle725 Potato/Patato. And I know what you meant. It's just terms dude. You must have had an overzealous science teacher who felt jaded on that subject at some point in his life.
12gaugebleachdrinker 6 months ago
Wait... I thought he was retired? Good for you professor!! Coming back and explaining the wondrous of nature.
Sockheadableful 6 months ago
@Sockheadableful He retired, but will still make videos.
Imakeplanesboom 6 months ago
So does that mean in 13,000 years Summer in the northern hemisphere will take place December through March?
ericfam01 6 months ago
That greek guy was clever!
AntiProtonBoy 6 months ago
@AntiProtonBoy yeah - I was blown away by that too! 150BC! Amazing...
jeebersjumpincryst 6 months ago
how in the world does someone dislike this, you guys/girls fail science or something?
KroniKolizon 6 months ago
By far, the best explanation of axial precession that I have heard thus far! Very well done!
acs197 6 months ago
there's no such thing as centrifugal force...
JK, loved the video. Shared it with my g/f and everybody on FB.
avecesdeunhilo 6 months ago
What caused earth's axial precession?
catsfromhell1 6 months ago
@catsfromhell1: Gyroscopic motion of the spinning Earth being pulled by the sun and moon, mainly.
puncheex 6 months ago
@puncheex Thanks.
catsfromhell1 6 months ago
Does this mean that every 13,000 years the seasons shift?
McC1oudv2 6 months ago 64
@McC1oudv2 I'm curious about this too. I think that this means every 13k years we have an ice age. No?
resotheque 6 months ago
@McC1oudv2 Yes and no... nobody would likely notice a difference, but technically season conditions which exist for the earth while it's on one side of the sun, would become reversed.
GimmieUtoob 6 months ago
@McC1oudv2: No. What happens is that, as a consequence, the dates for the equioxes and solstices will shift around a 13 000 year cycle.
CathySander 6 months ago
@McC1oudv2 no but the pole star changes.
RAV3xBinG3 6 months ago
@McC1oudv2 I wouldn't say that they shift, there is a slightly change on the axis degrees, that graphic is just illustrative, not enough to shift them. But yes, probably there's some kind of temperature change, Just an opinion. :)
ElCaza89 6 months ago
@McC1oudv2 no it means that ufo disclosure will happen within the next two years.
kooploo 6 months ago
@McC1oudv2 +- that 8 year wobble.
axelasdf 6 months ago
@McC1oudv2
No, the seasons won't shift, because our calendar is based on a tropical year, which is defined as the time from vernal equinox to vernal equinox, and this takes precession into account. By contrast, a sidereal year is the time taken by the Earth to orbit the Sun once with respect to the fixed stars. Google "tropical year" and "sidereal year".
Pulsar89 6 months ago 7
@Pulsar89 Thanks for answering this I was about to ask the same exact thing.
TheWejdin 6 months ago
@McC1oudv2
No. the seasons shift twice a year.
1337paladin 6 months ago
@McC1oudv2 not if we keep having leap years.
BruceCook87 6 months ago
Centrifugal? :o
yoshinibble123 6 months ago
Comment removed
csmaster65 6 months ago
Bah! I still don't completely understand rotation. It's frustating!
raydredX 6 months ago
Dear Sixty symbols,
I disliked this video because you completely overlooked that ancient civilizations from over 10,000 years ago have been measuring the procession of the equanoxes and building HUGE structures like the pyramids with measurements that would NEED to have knowledge of that 26,000 years cycle and the procession of the ages. Look at ANY ancient civilization past 10,000 years old like the Olmecs before the Maya or the indian civilizations that spawned the vedic texts. LRN2RESEARCH
RAV3xBinG3 6 months ago
@RAV3xBinG3 I don't know of a single ancient building related to the PRECESSION of the equinoxes. There are of course many related to solstices (the shortest and longest day of the year) and there may be some related to equinoxes (the days that have the same length than their nights). However, I doubt there may be too many buildings related to the precession of the equinoxes. Being a cycle of 26000 years, I doubt many ancient civs would have understood it, really.
cristianfcao 6 months ago
I bet he steals the globe when he retires.
pauldve 6 months ago
Woohoo
dazzaboy88 6 months ago
Is this why spinning tops start to wobble as they slow down? As the forces become unbalanced?
HELLJUMP3R7 6 months ago