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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
A Lunar
From: Jeremy C
Date: 2008 May 26, 23:30 -0700
From: Jeremy C
Date: 2008 May 26, 23:30 -0700
Earlier this month I shot a lunar, the first one in about 9 years. Here is the data: 8 May 2008 08h 08m 40s UTC. Fix was Lat 14deg 48.3� N; Long was 145deg 45.0E At that time I calculated the sun�s Hc at 5deg 27.2� and the moon�s Hc at 45deg 08.1� I shot a near distance and obtained an Hs of 38 deg 56.4� IE was 1.0� off the arc, Height of eye was 106 ft. I used Frank�s webpage to reduce the Lunar and obtained a corrected observation of 40deg 19.2� and a calculated lunar distance of 40deg 17.1� for an arc error of 2.1�. Unfortunately, this lead me to an error in time of 3m 36s which is 1deg 02� of Longitude. I am guessing that the low altitude of the sun contributed significantly to this error as I have never had much luck with low altitude sun shots. I really should have thought of it earlier, and shot the distance when the sun was about 20 degs in altitude. I am wondering what people are typically getting for errors? I am thinking that this is a bit much and I think with a bit more practice I can do better. Jeremy --~--~---------~--~----~------------~-------~--~----~ Navigation List archive: www.fer3.com/arc To post, email NavList@fer3.com To , email NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---
