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    Re: equinox
    From: Michael Dorl
    Date: 2004 Mar 21, 19:13 -0600

    At 07:48 PM 3/20/04 -0500, you wrote:
    >I get a declination of zero for the sun at 06:48:00 today on 3/20/04.
    >Don't have time to work out the longitude.
    >
    >Fred
    
    Just what defines the equinox?  My calculations say the apparent
    declination was zero at about 6:48:58
    so it sounds like we are talking about apparent declination.  Apparent
    declination includes corrections for
    
    light time
    nutation
    precession
    annual aberration
    
    since the light time is some 8 minutes (of time), the SUN actually passed
    the ecliptic some 8 minutes earlier.
    
    
    

       
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