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    Re: Aldebaran occultation
    From: Paul Hirose
    Date: 2017 Mar 5, 17:00 -0800

    On 2017-03-05 14:03, I wrote:
    > On 2017-03-04 22:48, Alexandre Eremenko wrote:
    >> The moment of disappearance I timed as March 5, 3:56:48 (GMT)
    >>
    >> 40d27.2'N, 86d55.8'W
    >
    > My Lunar4 program says Aldebaran is .02′ inside the Moon's limb at that
    > time. It puts the occultation 4 seconds earlier.
    
    The USNO MICA program agrees with Lunar4. Topocentric coordinates of
    both bodies from MICA:
    
    267.63519° 61.59173° Moon az, ZD
    267.71641° 61.33040° Aldebaran az, ZD
    
    That equals .27090° separation angle. MICA says semidiameter is 16′
    16.4″, which is .020′ greater than the separation angle.
    
    However, neither program accounts for the irregularities in the Moon's
    limb, which I believe are significant at this precision. My
    computational tools are not accurate enough to find any error in the
    observation by Alex.
    
    

       
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