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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Refraction:Which formula for Heigh ts below 15°
From: Andrés Ruiz
Date: 2022 May 19, 08:41 +0200
From: Andrés Ruiz
Date: 2022 May 19, 08:41 +0200
The correction for non standard conditions ( 10ºC, 1010 hPa) is:
f = P / 1010.0 * (10.0 + 273.0) / (T + 273.0);
(10 + 273) / 1010 = 0.28 in the formula of the AA
Other reference: HM Nautical Almanac Office: NavPac 4.2 (ukho.gov.uk) Hohenkerk
see: Steps for measuring and correcting Ho using a sextant.
Fair winds.
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