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Re: Calculating nutation with a spreadsheet?
From: Antoine Couëtte
Date: 2025 Jun 27, 00:12 -0700

An interesting issue for 0.05 arsecond star positions: how would you test your results?? You would need some trustworthy, high-quality resource that provides apparent star positions at that level. Do you have a source in mind? Anyone else??

The Astronomical Almanac publishes to +/- 0.0001s RA and +/- 0.001" Dec its yearly "Fictitious Star" Stellar examples computed through both the CIO and the Equinox methods (e.g. on pages B72-B74, 2025 Edition) with both methods yielding the very same numerical results.

Other sources : https://journals.ub.uni-heidelberg.de/index.php/apfs

and :

https://wwwadd.zah.uni-heidelberg.de/datenbanken/ariapfs/

Kermit

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