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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Old style lunar
From: Ken Muldrew
Date: 2004 Dec 16, 10:01 -0700
From: Ken Muldrew
Date: 2004 Dec 16, 10:01 -0700
On 16 Dec 2004 at 9:38, Alexandre Eremenko wrote: > But if Thompson's time is his local > apparent time (that is the time elapsed from > his local Sun culmination), > then his star altitude is close to the > correct value, and we still have no explanation > why his Lunar was so much off. I think the key problem is that the data he extracts from the almanac for the moon's RA and declination show an interval of only 3 minutes between the two lunar distance shots while his watch shows an interval of 9 minutes. Since his DR has to be the same for both, he must have made a mistake in determining Greenwich apparent time for one of the shots, losing 6 minutes somehow. Ken Muldrew.