NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Calibrating a sextant scale
From: Ken Muldrew
Date: 2007 Nov 20, 10:46 -0700
From: Ken Muldrew
Date: 2007 Nov 20, 10:46 -0700
On 20 Nov 2007 at 12:30, Fred Hebard wrote: > Yes, for star-to-star distances, you have to correct for spherical > aberration when clearing the observed distance, just like the moon. It's > been tried. The problem is getting a precise star-to-star distances. I > don't believe anybody claims to have solved that problem. The only > solution seems to be to take it to somebody who has a calibrating machine, > or roll your own if you have access to tens or hundreds of thousands of > dollars of optical equipment. A clever method for measuring micrometer eccentricity is described in a message from a couple of years ago here: http://fer3.com/arc/m2.aspx?i=026728&y=200512 Ken Muldrew. --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to NavList@fer3.com To , send email to NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---