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  • Matt Harden: Hey Bill, can you prove beyond a reasonable doubt that the earth is a sphere

  • and not flat? I have a lot of Facebook friends who say that it's an act. Thank you.

  • Bill Nye: Is the earth flat or round? It's round. Now, let's see, how do we go about

  • proving that? Go to the seashore. Go to the seashore and figure out why you can't, if

  • you live on the East Coast figure out why you can't see Spain from the East Coast or

  • North America? It looks like you might have a St. Louis hat on. I'm not sure. Just go

  • to the middle of the Mississippi River and look south. Why can't you see Louisiana? Why

  • can't you see New Orleans? What's the problem there? Then climb a tower or go to the top

  • of a hill or a mountain and you'll see a little farther, but you will not see to the other

  • side of the earth, places we know to exist. For example, I've been to London. I can tell

  • you other people have. I've been to Vancouver British Columbia and you cannot see Vancouver

  • British Columbia from Boise Idaho, let alone from New York City Or Toronto or what have

  • you. Just start there then if you'd like look at pictures from space where you see the earth

  • as a sphere. Those pictures are not faked. And I'll tell you if nothing else here is

  • why you can tell they're not faked. Just to create the paperwork that NASA has created,

  • NASA in this one case, just the paperwork to send anything out in space, to send people

  • into orbit or to send them to the moon, that amount of paperwork would make faking it prohibitively

  • expensive. No one could afford to generate that much documentation.

  • Then the other thing if you want to get into this, if your friends are really serious,

  • have them get on a boat or a ship and go out at sea and you'll noticed you can't see infinitely

  • far. Furthermore, if you get into it enough pick up a book about navigation or go online

  • and learn about navigation. A very, very Important thing you have to take into account when you

  • try to navigate the ocean from a ship or a boat is how high you are off the sea surface.

  • The higher you are off the sea surface the farther you can see, the farther away the

  • horizon is. Now, this discovery that the world is round was made - I'm going to say it was

  • published in 1540. Now, I concerned - it was Copernicus, I'm concerned it might have been

  • 1530, but it was about then. It was in the 16th century that the earth was shown to be

  • a ball. But it was known to be a ball by a lot of other people before Copernicus in the

  • Western World, what we now call the Western World the western hemisphere. The ancient

  • Greeks noticed that from time to time the earth casts a shadow on the moon. This is

  • a lunar eclipse's where the moon gets in the shadow of the earth, the sunlight is being

  • blocked by the earth, the moon is on the far side of the earth. And that shadow is always

  • curved. And the only shape that always produces a curve, no matter what the orientation, that

  • is to say whether you're standing in Greece at night or if you're standing then 12 hours

  • later in Buenos Aries at night, the shadow is always curved. So the ancient Greeks knew

  • that the earth was a ball. They didn't know the size of it to the degree of precision

  • we know now.

  • And you guys, come on, everybody watches newscasts. You all use mobile phones. You all see airplanes

  • fly around. You all go to see Ed Sheeran in concert one day in London, another day in

  • the Melbourne Australia. This all depends of our fundamental understanding of the size

  • of the earth and its shape with extraordinary precision. And if you want to get into it

  • the earth isn't quite a sphere, it's a little it's [NOISE], its spin is a [NOISE] stretched,

  • it made it slightly oblate as the saying goes. This is all susceptible to analysis, but spend

  • some time learning about navigation. Tell your friends to spend some time learning about

  • navigation. Navigation has change the world, by the way. What are you wearing? You're wearing

  • stuff that came from another part of the world on a ship. It didn't get here by magic, it

  • got here through science.

Matt Harden: Hey Bill, can you prove beyond a reasonable doubt that the earth is a sphere

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嘿,比爾-奈,"我們怎麼知道地球是圓的?"#TuesdaysWithBill (Hey Bill Nye, "How Do We Know the Earth Is Round?" #TuesdaysWithBill)

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    VoiceTube 發佈於 2021 年 01 月 14 日
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