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    Re: Star Sha & Dec changes.
    From: Peter Hakel
    Date: 2013 Jan 31, 20:56 -0800
    I also used Simbad; for Spica on January 1, 1500 I get:

    SHA: 165d 14.9'
    Dec: S 8d 30.4'

    see the attached interactive spreadsheet.


    Peter Hakel


    From: Antoine Couëtte <antoine.m.couette@club-internet.fr>
    To: pmh099@yahoo.com
    Sent: Thursday, January 31, 2013 8:47 PM
    Subject: [NavList 22217] Re: Star Sha & Dec changes.


    Re : [NavList] Re: Star Sha & Dec changes.
    From: Sean C
    Date: 31 Jan 2013 10:54
    Byron,
    As an example: For Spica in the year 1500, the SHA was ca. 165°15.0' and the Dec. was ca. S8°31.0'. Today's values are SHA: 158°31.4' Dec.: S11°13.8'. I used Stellarium (the program Frank recommended) to find these values.
    Regards,
    Sean C
    ******* ******* ******* *******
    From an independent Software, using the latest IAU theories for Precession Nutation and from the SIMBAD Star catalog I can find :
    Jan 01st, 1500 at 00:00 UT1 (with TT-UT=198.3 seconds of time : I know .... this one is quite totally superfluous ....)
    SPICA (Apparent Equatorial Coordinates)
    GHA = 274d11'0
    SHA = 165d14'8
    RA = 12h59m00.987s
    DEC = S-8d30'25.880"
    AP = 0.01306"
    Paul, could you please crosscheck the results here-above, if you have time ? :-)
    In view of the accuracy permitted by a Star-Finder, there are differences of some significance when compared with the Stellarium results : almost 3 degrees for SHA .... Any typo from your side, Sean ?
    Best Regards to all,

    Kermit
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    File: 122219.aries_stars.xls
       
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