NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Off Center Sextant Scope Observations
From: Fred Hebard
Date: 2007 Nov 23, 10:35 -0500
From: Fred Hebard
Date: 2007 Nov 23, 10:35 -0500
You can see this most clearly if you bring a star to coincidence, as for index correction determination, and then move the image around in the telescope. The apparent side error will change moving side to side, and, I suppose, the index error up and down (I don't know about the index error as I was observing for side error). Fred On Nov 22, 2007, at 7:39 PM, Greg Rudzinski wrote: > > What happens to an image of a celestial body when viewed off center in > a sextant scope? I have a bad habit of using the lower half of the > field of view when taking lower limb observations of the sun. I > suspect that this increases the observed altitude slightly. > > Greg Rudzinski > > --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to NavList@fer3.com To , send email to NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---