Don Casey - Dragged Aboard Storm Tactics Handbook:
Modern Methods of Heaving-To for Survival in Extreme Conditions
by Lin Pardey and Larry Pardey


      

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Re: Classification of the methods for clearing the Lunar Distances


Subject: Re: Classification of the methods for clearing the Lunar Distances
From: Noyce, Bill (william.noyce@XXX.XXX)
Date: Mon Apr 07 2003 - 16:50:33 EDT


Jan Kalivoda wrote:

> Borda (1778):
> cos A squared = cos M cos S sec m sec s cos[(m+s+d)/2] cos[(m+s-d)/2]
> sin D/2 squared = sin[A + (M+S)/2] sin[A - (M+S)/2]
>
> I cannot understand, why this cumbersome method gained such popularity.

One advantage of this method, as George Huxtable has pointed out, is that
it can be performed using logarithms with no need to take antilogs. Does that
account for its popularity?

Thanks for the very informative survey.
        -- Bill





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