Carl Sagan - "Our collective free time needs to shift as much as possible to education. Whether you're a young student or finished school long ago, get out to the library whenever you can and work hard to learn everything you can about this world. Each individual and society will benefit from being able to solve more problems and make better decisions. Education is an amazing discovery process that repays you endlessly."
We know now that Eratosthenes was right, but at the time, how did he know the sun was so far away that its rays are essentially parallel? If the sun had been a short distance from a flat earth wouldn't that also produce shadows of different lengths at different latitudes? Perhaps there is additional reasoning, too elaborate for Dr. Sagan to include here, that eliminates that possibility.
@gmsherry1953 -that's a very thoughtful comment and question, the kind of thinking that today's institutions of 'higher learning' rarely produce, kudos! In response I would say that your hypothesis on non-parallel sun rays certainly has merit on paper based on simple logic, however, wouldn't you agree that for it to have been plausible in the actual physical world all of the variables you mention would have to be extreme to say the least? very interesting comment, really made me stop to think!
@ACELLOFAWARENESS Given a flat earth, and a 7 degree angle over 800 km, the sun is 6,500 km high, or about 4,000 miles. That's much taller than any mountain, well out of the atmosphere -- not an obviously silly height for a large, hot object to be passing through the sky. Of course, a flat earth is disproved other ways -- the horizon; the horizon being farther from a height; approached mountains or masts of approaching ships gradually appearing. No flat-earth model (to be continued)
@gmsherry1953 has any explanatory value -- what happens at the edge of the earth, WHY do the sun and moon pass through the sky? And other observations of shadows may contradict the idea of a flat earth and nearby sun. I'm just not sure THIS observation does. I'm glad I made you think! My higher learning is c. 1970 so I'm not sure what is produced today.
@gmsherry1953 Interesting thinking. The sun is vastly bigger than the Earth and 800km surface where the light emanates from the sun can be approximated to a flat surface (because the circumference is so vast). So the light reaching that 800km area on earth is technically parallel. You can't calculate how far the source where parallel light emanates. The 7 degree is because the stick is at a 7 degree angle to the sun light.
@TemplarX2 I don't understand your comment. Eratosthenes didn't KNOW the sun was vastly bigger than
Earth and vastly distant, did he? He had two choices, a flat earth and a nearby sun, or a curved earth and a distant sun. I'm just not sure how he could decide between those theories based on data of the angle of shadows at noon. I understand that, GIVEN a round earth and a distant sun, the data enabled him to calculate the Earth's diameter. That's clear.
@gmsherry1953 Yes two choices. Assuming a flat earth and a close sun, the two sticks will be pendicular to the surface and the difference in angle can be explained by light hitting one stick at zero degree and the other (800 km away) at 7 degrees. For some reason he rightly dismissed that possibility. I thnk he might have made other observations to dismiss that flat earth hypo He could have had very good eyesight and observed sails sinking as ships moved further. This guy was a brain after all.
@TemplarX2 I think we agree. In an earlier remark, I said "a flat earth is disproved other ways -- the horizon; the horizon being farther from a height; approached mountains or masts of approaching ships gradually appearing. No flat-earth model has any explanatory value -- what happens at the edge of the earth, WHY do the sun and moon pass through the sky? And other observations of shadows may contradict the idea of a flat earth and nearby sun. I'm just not sure THIS observation does."
I love the part about Eratosthenes and his discovery... it really is so inspiring, to think that a man, so long ago with so little information could calculate so much!
sorry if it seems trivial, but i believe you mean "every human SOUL", soles are at bottom of the oceans & your feet/shoes, soul is what we unconsciously call the presence & recognition of the cosmic energy from which we are made
@piraat9990 He actually said "star stuff" - Neil Degrasse Tyson said "star dust" - a man semi-mentored by Sagan who's doing his own admirable bit for education and knowledge :D
Outstanding. I don't know how many times I've listened to people spout nonsense on this subject. "Columbus proved the earth was round" is a common one. When you tell them that the circumference of the earth was calculated over 2000 years ago they look at you like you're crazy. Its a face palm moment.
A Muslim chap was feverishly listing off the contributions to science that Islam has provided for humanity over the years, before any other civilization/nation/etc..
I am almost too embarassed that a fellow human would say this but he said that it was Islam which revealed the notion of a round Earth ;)
That doesn't prove anything other than something existed in parallel with certain information in the Qur'an, not that one necessarily derived from the other or vice versa. This is a Fallacy Known as Post Hoc Ergo Propter Hoc (it came after it, so this must have caused it. )
you have some great stuff here
TheKcsmithy 3 weeks ago
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brilliant video some very interesting points
jjclassjj 3 weeks ago
great video thanks
ttwilkable 1 month ago
some really good stuff here
samjenkinssam 1 month ago
This is a great video
shoppittsburghnow 1 month ago
love the video man
prchecker 1 month ago
Good Vids..
Flusercom 1 month ago
Good video. Thanks for shared, Very-very Helpull
Spasatcom 1 month ago
Aloha
darinsargent25 2 months ago
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Carl Sagan - "Our collective free time needs to shift as much as possible to education. Whether you're a young student or finished school long ago, get out to the library whenever you can and work hard to learn everything you can about this world. Each individual and society will benefit from being able to solve more problems and make better decisions. Education is an amazing discovery process that repays you endlessly."
TheLogicalBrain 4 months ago
THE EARTH IS FLAT!!!
sublime018 4 months ago
138 darkness worshipers?
leftauparxoun 8 months ago
We know now that Eratosthenes was right, but at the time, how did he know the sun was so far away that its rays are essentially parallel? If the sun had been a short distance from a flat earth wouldn't that also produce shadows of different lengths at different latitudes? Perhaps there is additional reasoning, too elaborate for Dr. Sagan to include here, that eliminates that possibility.
gmsherry1953 1 year ago
@gmsherry1953 -that's a very thoughtful comment and question, the kind of thinking that today's institutions of 'higher learning' rarely produce, kudos! In response I would say that your hypothesis on non-parallel sun rays certainly has merit on paper based on simple logic, however, wouldn't you agree that for it to have been plausible in the actual physical world all of the variables you mention would have to be extreme to say the least? very interesting comment, really made me stop to think!
ACELLOFAWARENESS 1 year ago
@ACELLOFAWARENESS Given a flat earth, and a 7 degree angle over 800 km, the sun is 6,500 km high, or about 4,000 miles. That's much taller than any mountain, well out of the atmosphere -- not an obviously silly height for a large, hot object to be passing through the sky. Of course, a flat earth is disproved other ways -- the horizon; the horizon being farther from a height; approached mountains or masts of approaching ships gradually appearing. No flat-earth model (to be continued)
gmsherry1953 1 year ago
@gmsherry1953 has any explanatory value -- what happens at the edge of the earth, WHY do the sun and moon pass through the sky? And other observations of shadows may contradict the idea of a flat earth and nearby sun. I'm just not sure THIS observation does. I'm glad I made you think! My higher learning is c. 1970 so I'm not sure what is produced today.
gmsherry1953 1 year ago
@gmsherry1953 Interesting thinking. The sun is vastly bigger than the Earth and 800km surface where the light emanates from the sun can be approximated to a flat surface (because the circumference is so vast). So the light reaching that 800km area on earth is technically parallel. You can't calculate how far the source where parallel light emanates. The 7 degree is because the stick is at a 7 degree angle to the sun light.
TemplarX2 5 months ago
@TemplarX2 I don't understand your comment. Eratosthenes didn't KNOW the sun was vastly bigger than
Earth and vastly distant, did he? He had two choices, a flat earth and a nearby sun, or a curved earth and a distant sun. I'm just not sure how he could decide between those theories based on data of the angle of shadows at noon. I understand that, GIVEN a round earth and a distant sun, the data enabled him to calculate the Earth's diameter. That's clear.
gmsherry1953 5 months ago
@gmsherry1953 Yes two choices. Assuming a flat earth and a close sun, the two sticks will be pendicular to the surface and the difference in angle can be explained by light hitting one stick at zero degree and the other (800 km away) at 7 degrees. For some reason he rightly dismissed that possibility. I thnk he might have made other observations to dismiss that flat earth hypo He could have had very good eyesight and observed sails sinking as ships moved further. This guy was a brain after all.
TemplarX2 5 months ago
Comment removed
gmsherry1953 5 months ago
@TemplarX2 I think we agree. In an earlier remark, I said "a flat earth is disproved other ways -- the horizon; the horizon being farther from a height; approached mountains or masts of approaching ships gradually appearing. No flat-earth model has any explanatory value -- what happens at the edge of the earth, WHY do the sun and moon pass through the sky? And other observations of shadows may contradict the idea of a flat earth and nearby sun. I'm just not sure THIS observation does."
gmsherry1953 5 months ago
@gmsherry1953
There wouldn't be shadows, or only faint ones, I think.
Apjooz 5 months ago
As if further proof were needed that Carl Sagan is a legend. He can sit in the middle of the desert in a tweed jacket without sweating.
NotHomelessAnymore 1 year ago
Eratosthenes is one smart guy lol
CCTV9 1 year ago
i wish i had more hands, to give this 4 thumbs up!
TooMuchToo0ften 1 year ago
This is amazing, I love humanity more than I can say.
Alpha1Bravo1Charlie1 1 year ago
@Alpha1Bravo1Charlie1 and humanity is still but a child learning to walk.
kaiyne316 1 year ago
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gooieslee 1 year ago
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gooieslee 1 year ago
I love the part about Eratosthenes and his discovery... it really is so inspiring, to think that a man, so long ago with so little information could calculate so much!
TwoBitColorPencil 1 year ago
Does anyone know the name of the song starting at 2:36?
diegopmc 2 years ago
Why is there a spambot marking down this brilliant series? I guess its a christian doing it...
newfagscanttrif0rce 2 years ago 11
this man is so peacefull nonbody cou;d dislike him
you1tube2009 2 years ago 8
what made him special was he was a poet, he understood the poetry of the star stuff.
Nibielari 2 years ago 5
Votebotting Carl Sagan is a weak as weak can be
jarnoverhoofstad 2 years ago 57
Carl Sagan,
The man that made the knowledge of the universe available for every human sole.
As he said:' We are made of stardust'.
Carl Sagan takes us back to our origins.
piraat9990 2 years ago 26
sorry if it seems trivial, but i believe you mean "every human SOUL", soles are at bottom of the oceans & your feet/shoes, soul is what we unconsciously call the presence & recognition of the cosmic energy from which we are made
d00m0racl3 2 years ago
@piraat9990 He actually said "star stuff" - Neil Degrasse Tyson said "star dust" - a man semi-mentored by Sagan who's doing his own admirable bit for education and knowledge :D
JagerLange 1 year ago
Eratosthenes was a fucking genious... I heard this story before but now will make a mental note to remember that man's name...
I salute you Eratosthenes... I will remember you...
RodHullIOnceWasHim 2 years ago 8
wow. i feel soooo not smart right now. lol. even with all the technology available to me now, i probably couldn't have figured that out.
mleonsmith 2 years ago 5
Yeah me too lol
BananaHurricane 2 years ago 3
We should ALL be so much smarter by now...
My childhood education was all about how Jesus died for my sins and how I should get right with God before the end times...
So sad...
leeroynaggins 2 years ago 7
I love this guy!
NaytronNeanderer 2 years ago 5
Long live flat earth!!!
77theway77 2 years ago 2
Long live middle earth!!
Hobble 2 years ago
middle earth was originally flat..... see the silmarillion :)
77theway77 2 years ago
Carl Sagan was an amazing man.
jtbovis 2 years ago 9
Outstanding. I don't know how many times I've listened to people spout nonsense on this subject. "Columbus proved the earth was round" is a common one. When you tell them that the circumference of the earth was calculated over 2000 years ago they look at you like you're crazy. Its a face palm moment.
Ansonidak 2 years ago 10
A Muslim chap was feverishly listing off the contributions to science that Islam has provided for humanity over the years, before any other civilization/nation/etc..
I am almost too embarassed that a fellow human would say this but he said that it was Islam which revealed the notion of a round Earth ;)
*Please spay or neuter your human pets*
freethinkersociety 2 years ago 7
That doesn't prove anything other than something existed in parallel with certain information in the Qur'an, not that one necessarily derived from the other or vice versa. This is a Fallacy Known as Post Hoc Ergo Propter Hoc (it came after it, so this must have caused it. )
tariq2322 2 years ago 2
Correct but it also proves that the scientific notion of a round earth did not come from the qur'an like the muslim argued.
omegavalerius 2 years ago 7