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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Lunars from Mt. Everest?
From: Frank Reed CT
Date: 2003 Dec 15, 20:37 EST
From: Frank Reed CT
Date: 2003 Dec 15, 20:37 EST
Yes, unlikely from Everest!
But suppose you shoot a practice 'land lunar' from, let's say, Denver. At 5000 feet altitude, the air's a bit thinner and the refraction is proportionately less (about 15%?). So if you're practicing lunars from a backyard on a mountaintop... beware. Forget to correct, and your lunars would be mysteriously off by as much as 0.5 minutes of arc on top of more mundane errors.
Frank E. Reed
[X] Mystic, Connecticut
[ ] Chicago, Illinois
But suppose you shoot a practice 'land lunar' from, let's say, Denver. At 5000 feet altitude, the air's a bit thinner and the refraction is proportionately less (about 15%?). So if you're practicing lunars from a backyard on a mountaintop... beware. Forget to correct, and your lunars would be mysteriously off by as much as 0.5 minutes of arc on top of more mundane errors.
Frank E. Reed
[X] Mystic, Connecticut
[ ] Chicago, Illinois
