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    Re: Lunar Distances with Alex's SNO-T
    From: Alexandre Eremenko
    Date: 2006 Nov 1, 11:05 -0500

    
    Bill,
    
    > Alex has in the past looked poorly on natural horizon IE/IC.
    
    1. Natural horizon is rarely so well defined as
    a star or a Sun's edge.
    2. The Russian book "Precision of astronomical observations"
    says that (based on large statistics) IC from horizon is much less
    precise than that from the Sun.
    
    > Alex has some stringent requirements on
    > accepting sun IE/IC checks with
    > semi-diameter figures based on the SNO-T manual
    
    Yes. SNO manual says that 4SD should match the almanac
    value to 0.4'. Otherwise, it says, the measurement should be repeated.
    And the previous result rejected.
    
    > Given the above paragraph and the rapid change of the moon's SD,
    > it seems
    > foolish to apply sun standards to the moon.
    
    It is only foolish to use the almanac value for the Moon SD.
    But the whole test seems to be sound.
    The almanac
    indeed does not give Moon's SD with sufficient
    precision. But Frank explained in a recent message how to compute
    Moon's SD.
    
    > You have noted in the past that a bit of side error may be useful
    
    Later Frank corrected this statement. It can be useful for IC
    checks with stars. But it is certainly harmful with Sun or Moon
    checks.
    
    Alex.
    
    
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