NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Lars Bergman
Date: 2011 Mar 21, 05:20 -0700
gl wrote
"In the 1939 Nautical Almanac the GHAs of the stars were given and then interpolated for time. There was no list of SHA so the increments for time were applied directly to the tabulated GHAs of the stars. In the 1941 Air Almanac they have SHAs and a tabulation of GHA Aries, the method used in the current Nautical Almanac. I am curious when the old system was abandoned and the SHA / GHA Aries system was instituted in the Nautical Almanac."
D.H.Sadler's personal history of the development of various Almancs can be found at
http://www.hmnao.com/nao/history/dhs_gaw/index.html
The story of Peacock and the introduction of SHA is covered in Part 2.
Lars, 59N 18E
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