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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Testing sextant arc error
From: Greg Rudzinski
Date: 2017 Jan 20, 05:03 -0800
From: Greg Rudzinski
Date: 2017 Jan 20, 05:03 -0800
Bill,
Sextant mirror parallax needs to be accounted for if done this way.
Greg Rudzinski
From: Bill Lionheart
Date: 2017 Jan 20, 08:12 +0000Suppose you got a 30m room and a ruler calibrared in mm at one end. Then point a well collimated laser from one end of the ruler to the mirror on the sextant (horizontal on a table) so reflected a spot on the ruler. 1mm would be approx 0.1 minute. Take the average either side of the dot and use arc tan on your calculator. Depending on the length of the ruler do the full arc in several stages.Would that work?Bill
