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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Two Mercury Lunars
From: Paul Hirose
Date: 2025 Dec 28, 20:37 -0800
From: Paul Hirose
Date: 2025 Dec 28, 20:37 -0800
I compute refraction with the Cassini formula, or Astronomical Almanac formula at low altitude. To prevent discontinuity where the models change, a weighted average is taken in the transition zone (10° - 15°). So below 10° (as in both Mercury lunars), my refraction model is simply the Almanac low altitude formula (2nd on this page): https://archive.org/details/binder1_202003/page/n203/mode/1up -- Paul Hirose sofajpl.com
