NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Greg Rudzinski
Date: 2015 Dec 4, 09:42 -0800
Frances,
Use this attached 229 calculator downloaded to your laptop. I also recommend a Ti-36x Pro. The num-solv function on this inexpensive solar pocket calculator will hold and save the Hc formula. For variables I use x= latitude, d= declination, t= LHA, a= altitude. If internet is available then why not USNO.
https://aa.usno.navy.mil/data/docs/celnavtable.php
Greg Rudzinski
From: Francis Upchurch
Date: 2015 Dec 4, 07:15 -0800To check the accuracy of my Bygrave and BN, I currently need to use the cosine formula with a calculator which is fairly tedious and time consuming. All the sight reduction apps I've seen need you to input sextant sight details etc. They are great for an actual sight reduction, but for a quick check of my my slide rule results, I really just need a quick app or program which gives me Hc from just Lat, Dec and LHA.
Could any of the experts recommend one or teach me how to program an HP 67 calculator emulator (free app) to do it? (by the way, I'm old enough to remember the HP67 from the late 70s. A dream machine which I could never afford ($600 then!)
Many thanks
Francis
