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Re: Dip from the deep blue origin
From: Alexandre Eremenko
Date: 2021 Jul 20, 14:36 +0000

Geometric dip is arccos(64/65) ~ 10 deg, and the distance to the horizon
is ~ 2500 km. The general formula for the dip
is arcsin((R/R+h)), where R is the radius of the Earth, and h is the height.
The general formula for the distance is sqrt(2Rh) when h is small in comparison with R.

This does not take account of refraction.

A.
________________________________________
From: NavList@fer3.com [NavList@fer3.com] on behalf of Frank Reed [NoReply_FrankReed@fer3.com]
Sent: Tuesday, July 20, 2021 9:29 AM
To: eremenko@math.purdue.edu
Subject: [NavList] Dip from the deep blue origin

What's the dip from 100km altitude? And what's the distance to the horizon?

Frank Reed

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