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Subject: Re: Rocky Mountain Lunar Distance
From: George Huxtable (george@XXX.XXX)
Date: Thu Dec 19 2002 - 02:12:18 EST
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
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george@XXX.XXX
George Huxtable, 1 Sandy Lane, Southmoor, Abingdon, Oxon OX13 5HX, UK.
Tel. 01865 820222 or (int.) +44 1865 820222.
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