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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: bubble sextant index error
From: Gary LaPook
Date: 2005 Dec 19, 11:18 -0800
From: Gary LaPook
Date: 2005 Dec 19, 11:18 -0800
If you do the calculations you will find that the altitude of polaris doesn't change more than one tenth of a minute for a 7 minute period before and after it is on the meridian. You have a period extending 49 minutes both before and after that its altitude doesn't change more than one minute of arc. I have been using this method for years for taking practice sights. Gary LaPook MIKE BURKES wrote: > Hi > >> >> Ken's suggestion makes sense on many levels. As the bubble is >> illuminated >> (mine is not) Polaris will remain relatively static for all practical >> purposes for a much longer period than the sun at LAN so is a better >> target. >> Additionally, of what practical importance is it if you have an IC and >> > >> > Ken Gebhart > >