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Even before we could reach extreme altitudes ourselves to see the curvature of the Earth, we could see extreme altitudes. Weather has been easily visible since long before any humans were around to see it. Just pay attention to the sky, which we moderns don't do much anymore. But ancient people did. Often, an incoming weather front at 30,000+ feet or more will be obviously curved. You can see how it extends away into the distance in a curve, not a straight line. The same kind of reasoning that allowed people to realize that the differing the angle of the sun would show the circumference of the Earth (Eratosthenes in the 3rd century BC) would surely lead people to realize that the curvature of high-altitude weather fronts was a sign of the curvature of the Earth itself.

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Helpful list of evidence that earth is a sphere 2939 dwm 09-Mar-16 04:19
Re: Helpful list of evidence that earth is a sphere 463 michael seabrook 09-Mar-16 10:28
Re: Helpful list of evidence that earth is a sphere 417 dwm 11-Mar-16 00:00
Re: Helpful list of evidence that earth is a sphere 439 carolb 09-Mar-16 14:31
Re: Helpful list of evidence that earth is a sphere 472 dwm 09-Mar-16 21:51
Re: Helpful list of evidence that earth is a sphere 416 carolb 10-Mar-16 12:59
Re: Helpful list of evidence that earth is a sphere 544 Aine 10-Mar-16 19:54
Re: Helpful list of evidence that earth is a sphere 381 dwm 11-Mar-16 00:02
Re: Helpful list of evidence that earth is a sphere 391 drew 11-Mar-16 05:22
Re: Helpful list of evidence that earth is a sphere 474 dwm 11-Mar-16 07:24
Re: Helpful list of evidence that earth is a sphere 506 carolb 11-Mar-16 12:51
Re: Helpful list of evidence that earth is a sphere 408 dwm 12-Mar-16 01:12
Re: Helpful list of evidence that earth is a sphere 355 drew 15-Mar-16 00:17
Re: Helpful list of evidence that earth is a sphere 376 dwm 15-Mar-16 13:36
Re: Helpful list of evidence that earth is a sphere 400 Nolondil 29-Mar-16 16:46
Re: Helpful list of evidence that earth is a sphere 841 carolb 29-Mar-16 17:31
Re: Helpful list of evidence that earth is a sphere 453 cladking 19-Mar-16 03:25
Re: Helpful list of evidence that earth is a sphere 500 dwm 19-Mar-16 04:10
Re: Helpful list of evidence that earth is a sphere 1008 carolb 19-Mar-16 23:04
Re: Helpful list of evidence that earth is a sphere 421 cladking 21-Mar-16 22:00
Re: Helpful list of evidence that earth is a sphere 503 carolb 21-Mar-16 22:42


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