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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Sextant Positions versus Map Datums?
From: Trevor Kenchington
Date: 2002 Jan 17, 3:56 PM
From: Trevor Kenchington
Date: 2002 Jan 17, 3:56 PM
Hal Mueller wrote: > Sextant positions are referenced to the surface of this ellipsoid, > not to a sphere. Thank you for that! But was I also wrong in suggesting that common sight-reduction procedures assume a spherical Earth? Or are we doing spherical trig with celestial positions calculated for an ellipsoid? Trevor Kenchington -- Trevor J. Kenchington PhD Gadus@iStar.ca Gadus Associates, Office(902) 889-9250 R.R.#1, Musquodoboit Harbour, Fax (902) 889-9251 Nova Scotia B0J 2L0, CANADA Home (902) 889-3555 Science Serving the Fisheries http://home.istar.ca/~gadus