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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
