NavList:

[NavList] Re: historical star coordinates
From: Peter Hakel
Date: 23 Oct 2012 22:21

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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):

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From Kermit and for fun : Kermit’s (K) values added here after : P03 Precession / IAU2000A Nutation, for 1 Jan -6000 00:00 UT with TT-UT = 195666 s Equatorial Apparent Coordinates

ANY TAKER to get and publish the best current results for the Stars , as well as for Mars and Neptune from the latest JPL Planetary theory ? (Paul, any other ???)

Best Regards to all,

Kermit

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Polaris:
RA (web): 20h 31m
RA (xls): 20h 31m
Dec (web): N 50d 00'
Dec (xls): N 49d 58' K : 20h30m30.0s / N+49°58’28’’

Acrux:
RA (web): 7h 04m
RA (xls): 7h 04m
Dec (web): S 29d 26'
Dec (xls): S 29d 28' K : 07h04m06.7s / S-29°21’50’’

Arcturus:
RA (web): 6h 25m
RA (xls): 6h 24m
Dec (web): N 60d 00'
Dec (xls): N 59d 57' K : 06h26m30.9s / N+60°04’20’’

Mars:
RA (web): 9h 37m
RA (xls): 10h 58m
Dec (web): N 17d 55'
Dec (xls): N 10d 06' K : 09h35m37.7s / N+17°42’27’’/ R = 1.0208 UA

Neptune:
RA (web): 23h 45m
RA (xls): 23h 45m
Dec (web): S 3d 50'
Dec (xls): S 3d 42' K : 23h44m44.7s / S-3°46’47’’/ R = 29.485 UA

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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