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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Assumed altitude method
From: Peter Fogg
Date: 2009 Jul 12, 17:07 +1000
Am informed that T D Davies' Sight Reduction Tables come in two volumes. One is for 42 stars and the other for the sun, moon and planets. Both are fairly large, about 220 X 300 cms. Latitude range is 0 - 60 degrees, Star places etc are based on the epoch of 1980, which introduces additional corrections when observations are made remote from 1980.
These tables are not understoond to have been popular, when compared with the standard Sight Reduction Tables NPO 401 and HO 229 which require four volumes to cover 60 degrees of latitude and a current Nautical Almanac.
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From: Peter Fogg
Date: 2009 Jul 12, 17:07 +1000
Dave Walden writes:
I have read "The Method of Assumed Altitudes: A New Approach to an Old Art" by T.D. Davies (from the ION disk). I don't yet have any of Davies' Tables themselves.
Am informed that T D Davies' Sight Reduction Tables come in two volumes. One is for 42 stars and the other for the sun, moon and planets. Both are fairly large, about 220 X 300 cms. Latitude range is 0 - 60 degrees, Star places etc are based on the epoch of 1980, which introduces additional corrections when observations are made remote from 1980.
These tables are not understoond to have been popular, when compared with the standard Sight Reduction Tables NPO 401 and HO 229 which require four volumes to cover 60 degrees of latitude and a current Nautical Almanac.
--~--~---------~--~----~------------~-------~--~----~
NavList message boards: www.fer3.com/arc
Or post by email to: NavList@fer3.com
To , email NavList-@fer3.com
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