NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Lunars
From: John Karl
Date: 2007 Sep 23, 10:16 -0500
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From: John Karl
Date: 2007 Sep 23, 10:16 -0500
I haven't checked the Nav List for some
time.... Now I see some discussion on Lunar Distance Tables this
month.
Some of you may want to check out my new book,
Celestial Navigation in the GPS Age, available from, www.celestaire.com or www.paracay.com . Among other
things, it discusses lunar sights using only the same old
understandable basics of CN, without using tables or approximations -- just a
hand calculator and the Almanac.
BTW, in the book I make the observation that
the sun-moon distance changes about one minute of arc per two minutes of
time. So to do better than finding UT to with one minute requires some
pretty adroit observing. And if the LD distance
were accurate to one minute of arc, the longitude would be accurate to only
about 30'. Doesn't this explain why the famous British
Parliament Prize was for determining longitude better than 30' of
arc??
John Karl
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To , send email to NavList-@fer3.com
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