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Re: GHA of the Moon
From: Frank Reed
Date: 2020 Oct 5, 14:11 -0700
From: Frank Reed
Date: 2020 Oct 5, 14:11 -0700
Hi Jim,
Attached you'll find the Moon's ecliptic longitude, latitude daily and hourly (two files) beginning at 00:00 Oct 6, 2020 (three hours from now as I type this) and continuing for twenty years. The data is given to a precision of 0.001° in the hourly table and 0.1° in the daily table. This is much more data than you need and at greater precision. Lots of ways to process this. Of course to apply to your visibility problem, you have to convert from ecliptic coordinates to equatorial RA (or SHA) and Dec and then to your altitude and azimuth. Although I did not include the Moon's daily, hourly parallax in these files, you can assume a constant 0.95° for low accuracy visibility issues (or just ignore the Moon's parallax).
Frank Reed
