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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: GHA Aries long term Table?
From: Greg Rudzinski
Date: 2014 Dec 17, 08:51 -0800
From: Greg Rudzinski
Date: 2014 Dec 17, 08:51 -0800
Sam,
Try extending the existing tables for a few years using the USNO web sight. Correct table 4 part a. so that year 2017 and beyond will match NSNO data. If E and Dec table values are off by more than a minute then a small correction there can be made. Photo copy corrected table and keep with the trig calculator.
Greg Rudzinski
From: Samuel L
Date: 2014 Dec 16, 19:05 -0800
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.
See here (page 339)-
http://www.waypointamsterdam.com/Han...Pub249Vol1.pdf
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.
See here (page 339)-
http://www.waypointamsterdam.com/Han...Pub249Vol1.pdf
I use it instead of carrying around the NA. (I can easily calculate Hc and Az using the Spherical Trig formulas so I can reduce the amount of paper on board).
But, that sheet will expire this year. Do you know of the same Table 4 for the coming years?
Or rather....do you know of quick, accurate way to determine GHA Aries?
Thanks,
But, that sheet will expire this year. Do you know of the same Table 4 for the coming years?
Or rather....do you know of quick, accurate way to determine GHA Aries?
Thanks,
Sam L.
