The Phases of the Moon

[126lma]

would be better without the music!

[ocozob]

Well-made video, explains the cycles simply and easily understandable. The music is a bit heavy tho.

[prettywickedawsome]

the music is toooo heavy 4 an educative video!

[volcacichuh]

Harshly groovy n to the point...is this used in school systems,should be..nice method ty.

[jananmasead]

When it is full moon the earth occurs between sun and moon why does it not block the light? It is because it is not in a straight line? if not how much is the degree? thanks

[WorldwideWakeupCall]

@jananmasead Moon orbits above and below the ecliptic. We just had a lunar eclipse the other morning. Next one in 2014.

[InsanityHere]

Thanks for posting the video. It had a description which I could actually understand. After researching the web and other YT videos, you actually hit the nail on the head (for me). I hate crappy explanations, which is what most of the web is composed of, on any topic. People are either too stupid, or too eductated to just get to the point. I hate those people for not asking themselves "Did I explain it correctly?".

[pvsciteach]

@InsanityHere Thanks. I'm glad to hear comments like this.  It makes it worth it.

[minde28383]

b and d thing really helps. thanks.

intro hard core music annoying but rest is perfect.

[prospector2456]

nice



[YudiLazar]

Thanks! Very nice explanation.

[AmokBR]

Great vid, but, can you tell me why you can see the new moon at night?

Moreover, you trick will only work on the northern hemisphere (it's the exact opposite in the southern hemisphere).

[alexoteles]

waxing comes from the german word "wachsen" which means to grow ;)

[Caliemje]

Great video!!!!

[Australiano75]

This is the same guy that did Zeigeist the movie.

[dair805]

Great job!!!

[MrHawkmann2]

My school sucks it's making YouTube suck

[MrHawkmann2]

This sucks I have to learn this for school :(

[fulsingh]

if the three elements(sun,moon & earth) are in line then some of the eclipse must occur ,so they may be in same (vertical) plane but not in a line when you say that during each cycle they are in same line (two times).

am I right ?

[pvsciteach]

@fulsingh You are correct.

[TruAgape123]

Please help I still don't get it. How can there be a full moon when the earth is clearly blocking the sunlight. Shouldn't the moon be in the earth's shadow at that point and therefore not able to be seen?

[schumifan78]

@TruAgape123 Because of the distances involved the slight off set in positions between the earth moon and sun when viewed from a side view (assuming the view shown in this video can be called "top" view) means that the shadow of the earth is not cast on the moon, at times though when the slight "wobbles" in the orbits of the earth and moon combine in a certain way the earths shadow does fall on the moon and this is when you see a lunar eclipse.

[themsmproduction]

wats the song in ending

[zhevsky17]

it really helps me alot! tnx

[TheBeardedThinker]

it's awesome thx

[iamalianna07]

thank you for all the information! I have my assignment now! and I knew more things and understand it after all the explanations and the video! =)

[xxfaith0chickxx]

I think it helps if you re draw this on paper with him speaking and put the earth at the bottom and the sun at the top for some reason

[trx125tracy69]

can the moon be in differant place in the sky,3 day's in a row?

[iLikePepsiMaximum]

Thank you this helped me understand his more so i know what im looking at throu my telescope :)

[genesis141000]

awsome

[mrsaj4]

That was one of the best descirptions I have seen. Thank you. My trick for students to remember waxing and waining is "wax on... wain off" :0)

[pvsciteach]

@mrsaj4 Thanks! I'm going to use the Wax on Wain Off trick too!

[AmokBR]

@mrsaj4 It's spelled "wane".

[koford]

ok, i got a question:

How long does it take moon to spin around in it own axis?

Anybody know?

[pvsciteach]

@koford It takes 27.3 days to rotate once on it's axis. That is also the amount of time it takes to revolve around Earth.

[Ichibaz]

@pvsciteach not true, the moon rotates its own axis about the same as the earth. so it takes about 1 day for the moon to rotate its own axis. that is the reason why we always see the same side of the moon.

[pvsciteach]

@Ichibaz I hate to tell you but the moon rotates once on its axis each time it rotates around Earth. It takes 27.3 earth days for that to occur. You should research the topic from a reliable source like NASA. Look at the Sidereal Rotation Period and the Sidereal Orbit Period. THAT is why we see the same side of the moon from earth all of the time.

[Ichibaz]

@Ichibaz hey, thanks I never knew, good thing I've got that clear in my mind now.

[Ichibaz]

@Ichibaz Mayeb I was a bit stubborn, but you know, it's always hard to be wrong.

[koford]

@pvsciteach That weird... if that is the case, we should se part ot the other side of the moon.

You know, our calender, a month dont have exact 27.3 days.

[koford]

Again, i have to explain... ask yourself this:

How long does it take earth to go around sun once?

Answer: 1 year.

How long does it take earth to spin around in it own axis?

Anser: 24 hour.

How long does it take moon to go around earth once?

Answer: 1 month

Get the ide'a ??

[tuesday2998]

@koford yeah now shut yo trap

[koford]

@tuesday2998 ohh shut up nub...but thanx for the comment :D

[koford]

I wondering.

Earth rotate in own axis... all other out there rotate in it own axis.

Why dont moon do it? Why does moon always show same "face".??

If you going to tell me it because mon rotate around earth, then i'm telling you that earth rotate around sun too... but earth still rotate in its own axis, so why dont moon do it?

[Deep4kinThoughts]

Awesome vid!!! Thanx!!

[kucherenkovera]

Nice film... Agli music...

[BlackOpsChick]

Thank you for actually helping me understand

[Cassandraberry]

Thank you. All very clear. Like the b and d mnemonic it really helps us to remember the order of the phases.

[carolynjgray]

Thank you for this excellent video. It really helped me help my daughter with her science homework!

[salihvaljevac]

Can you explain how we see crescent moon on a night sky (like in 2:45). It seems to me that in this phase we could not see it on a night sky, but only on a day sky.

[BigTerKC]

@salihvaljevac Were viewing the moon from our dark side, away from the sun. Were constantly spinning and the moon is moving around us. SO, in the first or last quarters the moon is at a right (90º) angle, so we can only see part of it illuminated. Were seeing just part of the front lit up.

Thats why you'll only see the first quarter in the west right after sunset and the last quarter just before dawn, were seeing just part of it lit up. Full moon's are always in the east as the sun sets west.

[profireroles]

What is the song called at 1:46 please i desperately need that name of the song?! =)

[pedestrianrevolution]

wow. that was really clear explanation. thx!

[jinky2go2]

i liked the music choice but it distracts from absorbing the info its really helped me with my children tho so thanks

[cycodevilboy]

Hell yeah, I like the music that goes with it. Pretty brutal for an educational film. :)

[cycodevilboy]

@cycodevilboy Damn, I knew that I should have waited until I watched the rest of the vid.. :(

[babyjaina71]

Awesome. Thank you so much for this video. I homeschool my second grader and we have been searching for awhile now for a good, animated explanation of the phases of the moon. Yours was the best so far! It was clear and easy to understand. Thank you for sharing!

[arenetv]

Very helpful. Now can you explain eclipses with the same animation?

[imamfollower]

good work

[lajungesombre]

If the Earth is between the moon and the sun, then how does the sun's light reach the moon? Wouldn't the Earth be blocking it? Or is the moon 'lower' or 'higher' than the Earth? I am confused as to how that happens. Please respond.

[Increazon]

its better

[judith0409]

Great music ! And it really helps me to explain to my students. Thanks a lot.

[bakuganbattlefan]

Imagine if the earth had its own phases... XD

[pvsciteach]

@bakuganbattlefan It does! If you are viewing the Earth from somewhere else... like the moon.

[pwnagful]

@pvsciteach TRUE TRUE!!!!

[vayarre]

Thank you for these videos. Good graphical teaching aids. But please remember that your mnemonic for remembering the shapes of the waxing and waning Moon, i.e. "b" for (new)born Moon and "d" for dying (old) Moon is only valid for half the world, and there is a whole other half for which it is NOT valid. Please don't forget about us down-under. (We also use You Tube.) We see the Moon as C-O-D (the shapes of first Q, Full, and Last Q.) while you northerners see it as D-O-C.

[pvsciteach]

@vayarre Sorry about that. I made this video for my classes here. I never thought about the global ramifications of posting it on YouTube. Thanks for the C-O-D trick. I'll be using that in my classes next year for sure!!!

[hugost101]

@vayarre I really liked this video, and this comment in particular. Few days ago I was on a long distance phone call with a friend, me in the North America, he was in South America. For some reason started talking about the moon at that time and the phases. While the phases were the same for both (probably this can be redundant to mention) but the light-side was the opposite for what we were seeing :)

[Iamakshdeep]

Thanks For the movie! Great for educational purposes. I read NCRT books and feel really short of learning. Please make more movie like that! Really i like dying and born learning tricks.

[mileygalway]

great video! However apart from the Colin Hay Tune the music was disgraceful!

[pvsciteach]

@mileygalway Disgraceful?... I was going for eclectic... sorry I missed the mark!

[TheFCCU]

real helpful ,, thanks ..

[brainjer2007]

tres bonnes explications  merci

[Elaina43]

I was admiring the thin sliver of tonight's crescent moon and thinking about this... thank you for posting.

Peace,

Elaina

(7/23/09)

[karla858t]

thanks..=)!