September 7, 2023 at 3:10 pm #10621XtophParticipant
I’m practicing sextant sights in my back yard with the Davies artificial horizon. Since I am at a known latitude and longitude, is it possible to validate my sights by comparing my Ha with a calculated Ho?
I figured, if I did everything correct, the two should match.
For the Hc at my location i would use this formula where
Latitude: Lat of my backyard
Declination: from almanac for the time of observation
LHA: GHA from almanac minus my Lat (i’m in Texas). For a LAN sight i should be able to use an LHA of zero.
Hc = asin[sin(Declination)*sin(Latitude) + cos(Latitude)*cos(Declination)*cos(LHA)]
If i now make my sight with the usual corrections, shouldn’t it be equal (or very close) to Hc?September 8, 2023 at 12:33 pm #10623XtophParticipant
Typo in the second sentence. It should read:
is it possible to validate my sights by comparing my Ha with a calculated Hc?
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