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Re: Sight Reduction Formula
From: Ralph Clampitt
Date: 2003 Oct 20, 11:01 -0800
From: Ralph Clampitt
Date: 2003 Oct 20, 11:01 -0800
Jan, Yes a mistake in transcribing the cosine formula for azimuth that I said I found most commonly referenced. Very sorry about that. Should have been "cos Z = sin Dec - (sin Hc * sin LAT)/(cos Hc * cos LAT)". Ralph Clampitt -----Original Message----- From: Jan Kalivoda [mailto:jan.kalivoda@FF.CUNI.CZ] Sent: Saturday, October 18, 2003 10:47 AM To: NAVIGATION-L@LISTSERV.WEBKAHUNA.COM Subject: Re: Sight Reduction Formula >I will return to Ralph's question again. >First of all, his purported "standard" formula for the Azimuth in the form "cos Z = (sin Dec [+ or abs. diff.] / (cos Hc * cos Lat)" seems erroneous. I have never seen it, but above all, it produces wrong results. See the file http://web.dkm.cz/kalivoda/Ralph.xls , where I tried the case with contrary names for Dec and Lat, too. (You have my last trial after several previous ones there.) Ralph's "standard" formula gives a wrong result. Maybe Ralph made a mistake while transcribing it?
