A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Greg Rudzinski
Date: 2014 Oct 14, 17:56 -0700
The Nautical Almanac is only good for one year on Moon and planet data. If absolute precision isn't needed then a Nautical Almanac exactly four years out of date can be used for Sun GHA and declination. Polaris, sunrise, sunset, twilight, and MP data is also useable. Star GHA of Aries needs 1.8' added. SHA and declination of stars will need to be printed from USNO web sight every few months and kept with the out of date NA. Check Ebay for old NAs.
If you have open ocean voyage plans then I suggest getting the correct year of Nautical Almanac.
From: Samuel L
Date: 2014 Oct 14, 05:02 -0700