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    Re: USCG Student Sample Problem #3 for East Longitude
    From: Yves Robin-Jouan
    Date: 2013 Apr 22, 07:58 -0700

    Dear Peter, Antoine and Greg,

    I had no ephemerids within my hand when I wrote my last message.
    "My" declination for ACRUX came from Wikipedia (!), but incidently at J2000 reference...
    Taking 63� 10.5'S for ACRUX declination gives these new results :

    DIPHDA+ACRUX+JUPITER: 25� 9.2' S 178�40.2' E at 17:12:17
    DOP = 1.87 dispersion radius = 0.38 NM
    25� 8.4' S 178�44.3'E when retrofitted at 17:00:00

    DIPHDA to SUN (5 sights):25�27.9' S 176�51.4' E at 22:00:26
    DOP = 1.43 dispersion radius = 1.85 NM

    With 3 sights at 17:00:00 our figures are harmonized finally.
    With 5 sights, dispersion is significant because of the long transport between Jupiter and Moon sights (94 NM, submitted to DR acuracy).
    We are in good agreement for MOON+SUN position.

    Thank you and Regards,


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