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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Lunars calculator
From: Jim Thompson
Date: 2005 Apr 2, 06:58 -0400
From: Jim Thompson
Date: 2005 Apr 2, 06:58 -0400
Jim wrote: >>On page 280 of the Nautical Almanac (2004): "If an error of 0.2' is >>significant (then the) expression for the parallax in altitude >>for the Moon >>should include a small correction OB for the oblateness of the >>Earth..." Frank replied: > I realize that you're aware of this, but just to be doubly sure > it's worth noting that that correction in the NA is the > oblateness for an observed altitude only. For lunars, where the > arc is measured at an angle across the sky, the correction is a > little different. I was not clued into that. Thanks for pointing it out, Frank. Jim
