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Correction vs. error
From: Paul Hirose
Date: 2024 Sep 25, 16:25 -0700
From: Paul Hirose
Date: 2024 Sep 25, 16:25 -0700
> *Lunar Distances with a Russian Sextant* > *From: *Martin Caminos > *Date: *2024 Sep 24, 19:44 -0700 > > Calculated distance between bodies using the nautical almanac: 21 39.0’ > > Measured distance corrected by refraction: 21 39.1 > > Index error: -0.1‘ The sign is reversed. Errors should be subtracted and corrections added. Or maybe not. I don't have the current Nautical Almanac, but the 2020 edition says, "calculate apparent altitude H = Hs + I - D, where I is the sextant index error." Is that a mistake? -- Paul Hirose sofajpl.com
