Пікірлер

• 
  @j.alexander494825 секунд бұрын

  This video proved nothing. A sun that rotates and changes position around the circle of the Earth can produce the same shadow results he described -which is what flat earthers believe.

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  @2ndSonofGod20 минут бұрын

  How did they traverse the distance to know that they were measuring at the same time? Did they do a video call?

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  @ForkThe620 минут бұрын

  I am not a flat-earther but is there a place from where one can observe both shadows at the same time. Before planes, satellites or instant communication, how would they be able to measure the length of the shadows in two different spots at the same time?

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  @Finraen30 минут бұрын

  These conspiracy theories about ancient technology… now Carl Sagan is saying the ancient Greeks could be in two places at once!?!?

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  @keithcanfield32512 сағат бұрын

  In order to deduce the Earth was spherical, Aristarchus first had to deduce that the Sun was very far away and its light rays were in effect parallel. That was even more amazing than concluding the Earth was curved.

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  @khairulnaeim7562 сағат бұрын

  Other Dimension is something almost impossible to enter but can be done sounds crazy but it exist...one view about not human made not a sun(light), we can say it other dimension...not a sun something bigger... just maybe...if you saw it exist but if you not see it become just story.... just maybe....we can say exist other creatures is real.... knowledge of the sky..human hard to understand.. because why human brain have limits... just maybe

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  @davidmiller40783 сағат бұрын

  Great stuff i wonder if this fundemental stuff is being explained at schools ? It used to be but i suspect its more about stupid pronouns pretending to be a cat and being force fed izlamic indoctrination ? While only critising Democracy but not Marxist Leninist Comunism ?

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  @RoyBattyLives3 сағат бұрын

  I used to be flat earther and I walked to the edge, I soon came around.

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  @michro19825 сағат бұрын

  The greeks were nasa

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  @sebastianvelasquez87876 сағат бұрын

  This explanation, (dubbed in spanish) is one of the most vivid memories of my childhood. It made so much sense, I've lived my life not taking anything at face value and looking for the possibility naked to our eyes. Thanks MR. Sagan, your spirit carries on.

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  @dmahan88416 сағат бұрын

  Earths been cooling for 15 years now.

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  @MisterLobb7 сағат бұрын

  I remember seeing this episode when it first played. I looked forward to watch this show each week.

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  @ryanoneill46917 сағат бұрын

  The Egyptians had worked that out way before the Greek invaded.

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  @Sly88Frye7 сағат бұрын

  You know I've heard the name Carl Sagan a lot and I don't know if I've actually seen him in anything else and not realized it was him but I'm glad this showed up in my shorts feed so I could see him and hear what he had to say. It's baffling to me that there are so many people in the world who actually believe that the world is flat. I mean it's so obvious that it's round

• 
  @colehara7 сағат бұрын

  So how did the Greeks in one city know that the shadow of the obelisk in the other city was a different length?

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  @jimbobeire5 сағат бұрын

  They wrote to each other. It happened every year on the summer solstice that there was no noon shadow in Cyene, as Cyene was on the Tropic of Cancer. Alexandria is north of the Tropic of Cancer, so the sun is _never_ directly overhead in Alexandria, but on that day it got to its highest point in the sky, about 7.1 degrees from vertical, which matches the difference in latitude between the two cities. Eratosthenes then estimated the size of Earth, and got a reasonably good estimate for that level of technology at the time.

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  @gregmcclung74978 сағат бұрын

  What alot of ancient greeks did was, ask questions. And they did get alot of answers. A ton to learn from our past. Everything really because the better we understand our past the better we can prepare for the future.

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  @djmech38718 сағат бұрын

  Such a simple explanation.

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  @0anant09 сағат бұрын

  Go 800km further south and you will find shadow in other direction and then u can conclude earth is a wave

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  @naj38449 сағат бұрын

  This actually a terrible example

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  @ridetheapex10 сағат бұрын

  11:11 And you wonder why nearly nothing has been done yet.

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  @Akira28210 сағат бұрын

  Coming back a year later, scientists are now saying we've blown past 1.5c above industrial average. Now, we are headed to 3c by end of century. This means the AMOC will likely collapse by 2095.

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  @kalon51110 сағат бұрын

  Maybe it's just me, but that logic seems a bit flawed. Even if the Earth were flat, there's still a chance that a shadow would/could be cast. The Earth moves around the sun. It does not remain stationary. Depending on how the Earth was laying and the direction in which it was revolving around the sun.... there should still be a shadow somewhere. The only way there shouldn't be is if the Earth's surface was directly facing the sun and the Earth remained stationary.

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  @chrisstandeford269910 сағат бұрын

  what about lando, lol?

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  @jimmystecher521410 сағат бұрын

  Wasn't Star Wars a Fictional movie?

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  @user-ui8or8cq7l11 сағат бұрын

  Whatever. Sagan was a CIA operative and a misleader of the public.

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  @luigirnotyourbusiness812711 сағат бұрын

  The Earth is flat

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  @andrewmiller457311 сағат бұрын

  Jesus, if it takes Carl to explain this.....Would any flat earther listen?????? No???

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  @patrickfreeman825711 сағат бұрын

  How would they know what shadows were like at two different points of the earth at any given time? Did they call each other up and say, "It's noon. What does the shadow look like?"

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  @jimbobeire5 сағат бұрын

  They could plan ahead to compare the noon shadows on the summer solstice and then compare notes later. It was already known that at Cyene on the summer solstice the sun was directly overhead at noon, so the shadow shrank until it disappeared briefly. Cyene was on the Tropic of Cancer.

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  @MM-lo9tk12 сағат бұрын

  Carl was such a pompous establishment tool. Can't understand why people outside of npcs liked him.

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  @BIgBass25512 сағат бұрын

  When was this 1977?

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  @jan_Masewin12 сағат бұрын

  Surely.... assuming the sun is a point light source, the only way the shadows would be the same is with a concave earth?

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  @suecondon168514 сағат бұрын

  Brilliant. Wonderful man with incredible insight.

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  @Heywoodthepeckerwood14 сағат бұрын

  Gawd I hate people like him. His pretentious gobbledegook bull crap.

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  @p.bhartisharma451614 сағат бұрын

  Every time I come across this, it always helps make me feel better

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  @Originalcopy2015 сағат бұрын

  Social media of today explained by someone from the past

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  @albiceleste10115 сағат бұрын

  Remember when the guy in Alexandria got the call that the other guy's obelisk had no shadow?

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  @marcusherrero413215 сағат бұрын

  And 39 years later.......

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  @einundsiebenziger548815 сағат бұрын

  All flatearthers admit that the earth is round, they all do believe in a circular disc, not a rectangular one.

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  @Jaccayumitty15 сағат бұрын

  I can't believe he got that so wrong. Yes, you can prove the Earth is round that way - but you need three sticks! With two, you can measure the diameter of the Earth, but only if you start with the assumption that it's round. Two sticks won't prove the Earth is round. A flat Earth can have no shadow at one stick and a long shadow at the other, it just means the sun is directly above the stick with no shadow. Then using the length of the shadow cast by the other stick and the distance between sticks, you could triangulate the height of the sun above the flat Earth. BUT - if you add a third stick, you find that you get three different locations for the sun, depending on whether you triangulate using the first and second, first and third, or second and third sticks. Add more sticks, and the problem just gets worse. The hypothesis that the Earth is flat is incompatible with the results. Try your experimental results with the hypothesis that the Earth has constant curvature and the sun is very distant relative to the size of the Earth, and suddenly all the results work neatly. *That's* how the ancients figured out the Earth is a sphere, and it's what enables us to navigate with sextants - one degree of change in the height of the sun, or the north star, equates to 60 nautical miles travelled north or south, regardless of where you are. Can't make that work with a flat Earth.

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  @soloperfection16 сағат бұрын

  When I was a kid I could not wait to get home from school. Becouse they were showing the complete series of cosmos on PBS back when I was 8 years old. 1976. I now have it on DVD. I still injoy watching it. Carl's version is leaps and bounds better then Neal's...

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  @hubertwach823517 сағат бұрын

  Let me explain. Actually, it is because the sun is 50 km above our heads. Ancient greeks so dumb to believe earth was a sphere.

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  @augustinf17 сағат бұрын

  I don’t get how they could know what was going on at such distance at the same instant. Where they relaying information through a network of people shouting to the next?

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  @superslayerguy16 сағат бұрын

  Yeah the explanation makes sense but opens a new question

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  @jimbobeire5 сағат бұрын

  Almost as if those huge obelisks weren't just for decoration... and these people could read, write, and sail along the Nile to meet up later and compare notes... but sure... "shouting".

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  @augustinf2 сағат бұрын

  @@jimbobeire hey genius.. how did that work, they synchronized their wrist watches with an atomic clock to compare notes at a given instant? 🤦‍♂️

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  @jimbobeire2 сағат бұрын

  @@augustinf Cyene being on the Tropic of Cancer is a relevant fact here, and the height of the obelisk in Alexandria is also relevant. If you weren't so arrogant and rude, I wouldn't mind explaining it fully, but I don't reward rudeness, so google it yourself.

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  @augustinf2 сағат бұрын

  @@jimbobeire you were the one rude in the first place man. Sagan didn’t explain any of the logistics involved, and it got me curious. In ancient times you had strategic outposts to relay information in real time with fires, blowing horns, using mirrors with sunlight to prevent attacks I thought they might have something similar.

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  @richvail755117 сағат бұрын

  But…….

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  @patricktuorto17 сағат бұрын

  “BullSh*t Carl!” - Flat Earthers

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  @therespectedlex979418 сағат бұрын

  I find it hard to believe this fella now.

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  @hcmcjb18 сағат бұрын

  They must have had telephones or teleport abilities back then to compare shadows -.-

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  @earnhar76818 сағат бұрын

  Clouds

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  @gussstavo18 сағат бұрын

  They had clocks?

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  @jimbobeire4 сағат бұрын

  They had obelisks.

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  @tonyjohnson892919 сағат бұрын

  If you wonder why i appreciate intelligence... perfect example right here.

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  @rudradevil19 сағат бұрын

  They definitely apparated to confirm. 🤷