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    Planet rising
    From: Dave Weilacher
    Date: 2002 Feb 1, 17:15 -0500

    Okay.
    
    I asked this question before and got hints.
    
    Then the discussion about sunrise, sunset, etc, made a big clue.
    
    I still don't have it nailed down yet, though.
    
    So.  How do you compute the time a planet rises.
    
    I've got the meridian passage of the planet from the daily pages of the nautical almanac.  Good.
    
    It's true rise should occur at 90 degrees before then.  Arc to time has this convert to 6 hours earlier.
    
    Its apparent rise should have some factor for refraction.  (by way of example, 
    the sun has 14 minutes in its 50' adjustment).
    
    Does anyone have a notion what it should be for a planet.  The Nautical 
    Almanac doesn't give a correction for anything below 9 degrees.
    
    
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