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Re: Rocky Mountain Lunar Distance
From: George Huxtable
Date: 2002 Dec 19, 07:12 +0000
From: George Huxtable
Date: 2002 Dec 19, 07:12 +0000
I said- >> And >> just making an ordinary linear interpolation for times within this 12-hour >> interval gives rise to a worst-case interpolation error of around 4 >> arc-minutes in the Moon's declination. That is sufficiently accurate that a >> calculated altitude based on that dec. will not affect the accuracy of >> clearing the lunar distance. Bill Noyce replied- > >But hadn't you better use a better declination when actually figuring >the "computed distance" to which you then compare your cleared distance? >Not a problem for navigators in Maskelyne's day, when these computed >distances were tabulated at 3-hour intervals... And he's absolutely right. Thanks, Bill. George Huxtable ------------------------------ george@huxtable.u-net.com George Huxtable, 1 Sandy Lane, Southmoor, Abingdon, Oxon OX13 5HX, UK. Tel. 01865 820222 or (int.) +44 1865 820222. ------------------------------