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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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