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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: Alexandre Eremenko
Date: 2004 Dec 16, 09:50 -0500
From: Alexandre Eremenko
Date: 2004 Dec 16, 09:50 -0500
It seems clear to me that it is better to measure altitudes with lunars than not to measure. Both for the accuracy and to reduce the computations. (I would use computed altitudes only if no horizon is available, natural or artificial, for example on a ship in the middle of the night, or on land when the altitudes are more than 60). Both for the accuracy and to reduce the computations. The examples we have seem to show that perhaps the procedures of British (Australian) surveyors were different from the procedures of the US surveyors:-) Anyway, it is interesting to know where the advise "not to measure altitudes" comes from and what was the justification. Alex. On Thu, 30 Dec 2004, Kieran Kelly wrote: > I know this may not have been true for Thompson et al > but the Australian, > Gregory always measured the altitudes when doing lunars, > as shown in the > paper at ld-DEADLINK-com referred to on this list recently. > Not sure why > he did, (he was later then Thompson) > although he achieved extremely accurate > results. > Kieran Kelly > Sydney Australia >