A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Frank Reed
Date: 2014 Dec 17, 12:04 -0800
Sam L wrote:
2015 is coming....surely.
HO 249 Volume 1 page 340 has "Table 4- GHA Y for the years 2006 to 2014" which is a very compact way to determining GHA Y (Aries) for stars.
While the US government is no longer maintaining Pub. 249, Celestaire is maintaining and publishing new editions using the same USNO source data. You can download a copy of vol. 1 for epoch 2015.0 here: https://www.celestaire.com/pubs/category/3-pub-249.html. Of course, you can also purchase a printed copy from Celestaire, too. For GHA Aries, all you need is the updated table for the first of each month for future years. I am attaching a screen capture from the Celestaire file of that data for the years 2011 to 2019 (this is copied directly from the file which you can download at the link above).
Conanicut Island USA