NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Finding stars in daylight
From: John D. Howard
Date: 2019 Jul 13, 09:59 -0700
From: John D. Howard
Date: 2019 Jul 13, 09:59 -0700
Gary,
When you said that as long as the axis of your level is vertical it does not matter about the axis of the telescope - well, I agree if and only if the axis of the telescope is perpendicular with the plane of rotation of the vertical axis.
Consider a telescope that the vertical axis is straight up but the telescope axis is tilted slightly left down. As long as you take azimuths at zero elevation the all azimuths are good. Now point the telescope south and start raising the elevation. Because the left side of the telescope axis is low as you go up in elevation the scope will point more and more east.
The adjustment of a surveyor's transit is here:
https://books.google.com/books?id=cY5CAQAAMAAJ
pages 86 - 90 On page 90 it talks about the importance of adjustment three ( the telescope axis ) when finding the azimuth of stars.
John H. 41N 100W
