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Re: Mr. van Asten's method of measuring sunset with a bubble sextant
From: Gary LaPook
Date: 2013 May 6, 16:47 -0700

Sorry about the typo, the Ha should be 53'.

So lets go through van Asten's computation again, this time doing it correctly. Hs = 53' IC - Dip - -------------- Ha = 53' Ref - 25' SD - --------------- Ho = 28' Hc= 0' ------------------ Int = 28 NM toward. Mr. van Asten should have plotted his LOP 28 NM toward 293̊ T, the azimuth of the sun at that time and place. This means that his claimed position is at least 28 NM in error!!

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