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    Re: Sun Moon Lunars to 155 degrees
    From: Peter Hakel
    Date: 2010 Apr 2, 13:21 -0700
    My thanks to Kermit for his excellent explanation of the terminology.  So,
    Flattening: not quite spherical shape of the Earth
    Oblateness: refraction-induced "apparent flattening" of the observed Sun or Moon disc.
    All clear now.


    Peter Hakel



    From: Antoine Couette <antoine.m.couette{at}club-internet.fr>
    To: NavList@fer3.com
    Sent: Fri, April 2, 2010 10:46:38 AM
    Subject: [NavList] Re: Sun Moon Lunars to 155 degrees

    Dear Peter,

    When clearing Lunars, two effects can sometimes be significant and each of them can independently affect the resulting cleared Lunar distance by at least 0.1'.


    ADDITIONNAL PARALLAX CORRECTION RELATED TO THE FLATTENING OF THE EARTH


    ADDITIONNAL EFFECT DUE TO (DIFFERENTIAL) REFRACTION WHICH DISTORTS THE SHAPE OF THE SUN AND OF THE MOON

    [parts deleted by PH]

       
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