NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Lunar Exercise
From: Jeremy C
Date: 2008 Sep 23, 14:21 -0700
From: Jeremy C
Date: 2008 Sep 23, 14:21 -0700
I was playing with my new sextant here and got the oppurtunity to
shoot a land lunar. My paper calculation had a bit more error then
Frank's web calculator, but perhaps I was doing something wrong with
one or both of them. I will have to re-run the numbers. Here is the
Lunar if anyone is interested in working it.
A Lunar Exercise:
Our intrepid Navigator is wandering through the city of Wilkes-Barre,
PA, USA. He wanders upon a stone in the public square that states the
following: Latitude 41 deg 14 min 40.4 sec North, Longitude EAST OF
WASHINGTON, DC is 1 deg 10min 4.5 sec. The Longitude of the Mall
in Washington DC is 77 deg 02.2 min West.
A series of near limb lunars is taken at the stone between the sun
and the waning crescent moon. Index error is 0.2� on the arc.
Temperature is 66 deg F, pressure is 30.50 inches of mercury. A
uncorrected watch (ie no GMT) was used and the lunars were made over a
period of about 5 minutes centered on 1545 UTC.
Lunar Distance on the Sextant (LDs)
71 deg 06.7�
71 deg 05.7�
71 deg 06.0�
71 deg 06.0�
71 deg 06.7�
71 deg 06.0�
71 deg 04.9�
71 deg 04.8�
71 deg 04.2�
71 deg 04.5�
Average the lunars and find UTC.
JCA
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