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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Sundog
From: Bill B
Date: 2013 Feb 11, 20:18 -0500
From: Bill B
Date: 2013 Feb 11, 20:18 -0500
On 2/11/2013 2:48 PM, Frank Reed wrote: > ------------------------------------------------------------------------ > > There was a very bright sundog yesterday at sunset here. Photo linked. > > Here's a little navigation puzzle: you're walking in a hilly area near > sunset on February 10 in latitude 41 N. You see a sundog about 5 degrees > high directly ahead of you but you can't see the Sun (behind a hill to > your left). In what direction are you walking? Using 41d N and 75d W with the center of the sundog at 5d I've plugged in the following: declination: 14d 03!7 dip: -2!7 refraction: -9!8 temp/press correction: -0!6 (nor'easter) Hc: 4d 46!9 Azimuth: 246d 41!1 Sundog offset: 22d Direction approx: 268D 41!1 Bill B
