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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Advice concerning sextants
From: Patrick Goold
Date: 2010 Dec 31, 13:03 -0500
From: Patrick Goold
Date: 2010 Dec 31, 13:03 -0500
Gentlemen,
Very helpful comments! I appreciate your patient interest in helping a rank beginner! Thanks to your observations and advice, today's sun site produced a calculated latitude only two tenths of an arc-minute from the gps number! I attribute the improvement to four factors:
One question: can I hurt my eyes doing this?
Patrick
Charles Olson: "Love the World -- and stay inside it."
Very helpful comments! I appreciate your patient interest in helping a rank beginner! Thanks to your observations and advice, today's sun site produced a calculated latitude only two tenths of an arc-minute from the gps number! I attribute the improvement to four factors:
- It was a much clearer, brighter day than the two previous;
- I arranged my observatory so that I could sit and be close the the artifical horizon;
- I read the declination for my LAN, which is GMT plus 5 hours
- I calculated the actual LAN as George did and made sure I shot through it.
Actual sextant reading 59º 43'
Divided in half 29º 51.5'
Lower limb correction +14.6'
Ho 30º 06.1'
ZD 59º 53.9'
Declination 23º 04.1'
Latitude 36º 49.8'
GPS latitude 36º 50'
Divided in half 29º 51.5'
Lower limb correction +14.6'
Ho 30º 06.1'
ZD 59º 53.9'
Declination 23º 04.1'
Latitude 36º 49.8'
GPS latitude 36º 50'
One question: can I hurt my eyes doing this?
Patrick
Charles Olson: "Love the World -- and stay inside it."
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