NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Sestrel sextant thoughts?
From: Alexandre Eremenko
Date: 2020 May 24, 02:19 +0000
From: Alexandre Eremenko
Date: 2020 May 24, 02:19 +0000
I think I have a simple explanation. You wrote: > For decades, if not centuries, sextant Manufacturers have been publishing Eccentricity "Calibration" corrections in arc seconds while most generally the verniers show [sub-]arcminutes. > Why so ? Big mystery to me . Those manufacturers use the device measuring the arc correction, and this device is graduated in seconds. The person who measures the correction just writes what he sees. Which is natural. Once I was present during the procedure (with Freiberger). They sertified my SNO-T sextant, and the corrections are written in seconds, though both SNO-T and Freiberger sextant are graduated in minutes. The device they used looked very old. Alex.
