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    Re: historical star coordinates
    From: Peter Hakel
    Date: 2012 Oct 23, 22:21 -0700

    Selected comparisons for the year -6000 between Sky View Cafe and Navigation Spreadsheets. Declination is in columns D-F (and X), right ascension (in degrees) is in column W (for stars) or cell B162 (for planets):

    Polaris:
    RA (web): 20h 31m
    RA (xls): 20h 31m
    Dec (web): N 50d 00'
    Dec (xls): N 49d 58'

    Acrux:
    RA (web): 7h 04m
    RA (xls): 7h 04m
    Dec (web): S 29d 26'
    Dec (xls): S 29d 28'

    Arcturus:
    RA (web): 6h 25m
    RA (xls): 6h 24m
    Dec (web): N 60d 00'
    Dec (xls): N 59d 57'

    Mars:
    RA (web): 9h 37m
    RA (xls): 10h 58m
    Dec (web): N 17d 55'
    Dec (xls): N 10d 06'

    Neptune:
    RA (web): 23h 45m
    RA (xls): 23h 45m
    Dec (web): S 3d 50'
    Dec (xls): S 3d 42'

    I think this is a decent agreement, except for Mars - I don't know why there is such a big difference there; sorting this out would require some digging...


    Peter Hakel

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    Attached File:
    polaris.xls

    Attached File:
    aries_stars.xls

    Attached File:
    mars.xls

    Attached File:
    neptune.xls

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