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Subject: Re: Star proper motion
From: Russell Sher (rsher@XXX.XXX)
Date: Tue Nov 20 2001 - 09:14:42 EST
Aubrey - have you looked at http://www.nao.rl.ac.uk/ (Nautical Almanac
Office) for their publications offered. Among otheres they offer are
Technical Notes about which they suggest: 'These documents are aimed at the
more specialised user who requires information on techniques and methods
used by the HMNAO for calculating such data as the positions of astronomical
bodies and the occurrence of astronomical phenomena.'
There is also a Astronomy Information service.
They may be able to offer some assistance.
The only (vague) suggestion which I can offer is that perhaps some of the
publications which you consulted use so-called 'perpepual' formulae which
taper off in accuracy with time.
Russell
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