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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Precalculating LHA(t) for Fixed Angle Reflectors
From: Greg Rudzinski
Date: 2018 Jun 7, 18:34 -0700
From: Greg Rudzinski
Date: 2018 Jun 7, 18:34 -0700
Attached is a plot for today's underway Sun observation using a precalculated LHA(t) with a high altitude (73° fixed reflection) Bris sextant.The LOP was within 3 nautical miles of GPS and overlapped with the standard sight reduction using the GPS position as the assumed position. I don't think I'll be making a habit of doing this but it is a sight reduction option for those who would rather do all the math at the dock so that only a GHA nautical almanac look up to sum with the precalculated LHA needs doing for longitude.
Greg Rudzinski
File:
