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cladking Wrote:
-------------------------------------------------------
> carolb Wrote:
> --------------------------------------------------
> -----
>
> > Anyway, Cladking, if you read this, I don’t
> > think you could see the curvature quite so
> > easily.
>
> You may need a little longer straight edge or a
> little more altitude on a small body of water but
> it does work.

Not from sea level. As I explained in my post above, earth is just too big to perceive a curve by looking out over a body of water from sea level.

And pilots can't see it at less than 50,000 ft.

[thulescientific.com]

Quote

Interviews with pilots and high-elevation travelers
revealed that few if any could detect curvature below
about 50; 000 ft. High-altitude physicist and experienced
sky observer David Gutierrez [6] reported that
as his B-57 ascends, the curvature of the horizon does
not become readily sensible until about 50; 000 ft and
that at 60; 000 ft the curvature is obvious. Having
talked to many other high fliers (SR-71, U2, etc.),
Gutierrez confirms that his sense of the curvature
is the same as theirs. Passengers on the Concorde
(60; 000 ft) routinely marveled at the curvature of
the Earth. Gutierrez believes that if the field of view
(FOV) is wide enough, it might be possible to detect
curvature from lower altitudes. The author has also
talked to many commercial pilots, and they report
that from elevations around 35; 000 ft, they cannot
see the curvature.

Carol

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Subject Views Written By Posted
Helpful list of evidence that earth is a sphere 2937 dwm 09-Mar-16 04:19
Re: Helpful list of evidence that earth is a sphere 461 michael seabrook 09-Mar-16 10:28
Re: Helpful list of evidence that earth is a sphere 416 dwm 11-Mar-16 00:00
Re: Helpful list of evidence that earth is a sphere 436 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 413 carolb 10-Mar-16 12:59
Re: Helpful list of evidence that earth is a sphere 542 Aine 10-Mar-16 19:54
Re: Helpful list of evidence that earth is a sphere 380 dwm 11-Mar-16 00:02
Re: Helpful list of evidence that earth is a sphere 389 drew 11-Mar-16 05:22
Re: Helpful list of evidence that earth is a sphere 473 dwm 11-Mar-16 07:24
Re: Helpful list of evidence that earth is a sphere 504 carolb 11-Mar-16 12:51
Re: Helpful list of evidence that earth is a sphere 406 dwm 12-Mar-16 01:12
Re: Helpful list of evidence that earth is a sphere 351 drew 15-Mar-16 00:17
Re: Helpful list of evidence that earth is a sphere 374 dwm 15-Mar-16 13:36
Re: Helpful list of evidence that earth is a sphere 398 Nolondil 29-Mar-16 16:46
Re: Helpful list of evidence that earth is a sphere 840 carolb 29-Mar-16 17:31
Re: Helpful list of evidence that earth is a sphere 450 cladking 19-Mar-16 03:25
Re: Helpful list of evidence that earth is a sphere 498 dwm 19-Mar-16 04:10
Re: Helpful list of evidence that earth is a sphere 1005 carolb 19-Mar-16 23:04
Re: Helpful list of evidence that earth is a sphere 418 cladking 21-Mar-16 22:00
Re: Helpful list of evidence that earth is a sphere 501 carolb 21-Mar-16 22:42


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