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Re: Calculating nutation with a spreadsheet?
From: Paul Hirose
Date: 2025 Jun 26, 13:51 -0700
From: Paul Hirose
Date: 2025 Jun 26, 13:51 -0700
> *From: *Brian Villmoare > *Date: *2025 Jun 26, 10:19 -0700 > > I am hoping to get in the neighborhood of 0.1 to 0.05 arcsecond > accuracy. That's 'hoping', not necessarily expecting. For computations within a few decades of the present, the IAU 2000 B nutation model may be satisfactory. "The IAU 2000B model is an abridged version of the full 1365-frequency IAU 2000A model. It is a fraction of the size (smaller even than the IAU 1980 model) and achieves 1 mas accuracy throughout 1995-2050." http://www.iausofa.org/sofa_pn_c.pdf C language source code is at the SOFA site. There are also Fortran versions of all their routines. http://www.iausofa.org/2023_1011_C/sofa/nut00b.html -- Paul Hirose sofajpl.com
