NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: How did Sumner navigate in 1837?
From: Bill Noyce
Date: 2003 May 19, 08:34 -0400
From: Bill Noyce
Date: 2003 May 19, 08:34 -0400
Jim Thompson asks: > To further demonstrate my ignorance, have I made the correct defintions for > the variables? > T = chronometer GMT > D = declination (from almanac) > L = latitude (from dead reckoning) > H = altitude (from sextant) > > log (1-cos T) = log [cos(D-L) - sin H] + log sec L + log sec D T here is the "Local Hour Angle" -- the angle at the pole between the body's meridian and the observer's. I believe you've got the others correct. Of course, H represents the sextant altitude *after corrections*. -- Bill