Two On A Big Ocean The Story of the First Circumnavigation
of the Pacific Basin
in a Small Sailing Ship


      

Other Books by
Hal Roth
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Re: Planet rising revisited


Subject: Re: Planet rising revisited
From: Chuck Taylor (ctaylor@XXX.XXX)
Date: Tue Feb 05 2002 - 19:19:17 EST


Dave W wrote:

> What practical use would a navigator have for determining when a planet
> would rise? (other than at twilight

In a lifeboat at sea with no sextant, the rising or setting of a planet (or any
other body) gives you a "free" sight (hs = 0). This is certainly not as good as
a real sight with a sextant at twilight, but it is better than no sight.

Chuck Taylor
 47 degrees 55.161 minutes North Latitude
122 degrees 11.176 minutes West Longitude





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