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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Index Error
From: Fred Hebard
Date: 2004 May 7, 16:19 -0400
From: Fred Hebard
Date: 2004 May 7, 16:19 -0400
On May 7, 2004, at 10:54 AM, Robert Eno wrote: > So let me get this straight: > > 1. Any index error in the sextant will be reflected by one reading > differing from the other; that is the upper limb observation may be > greater than it should be, while conversely, the lower limb observation > would be less than it should be. They should balance each other out. > > 2. The sum total of the off and on readings divided by four should > yield > the correct semi-diameter. There is no need to factor in the index > correction because one value should balance out the other. In > otherwords, > the index correction is already inherently factored in by virtue of the > upper and lower limb values differing by X minutes of arc. > > Am I on track here gentlemen? > > > Robert > yes
