A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Bill Lionheart
Date: 2016 Jan 28, 13:42 -0800
Thanks Greg I enjoyed repeating your calculations. I couldn't get the same pixel distance though. I used Gimp to get the centre of mass of the sun, then used the measurement tool to measure to the horizon. I got 2403 pixels not 2401 which gives me 1.1' difference to you. I wonder if you used the raw rather than jpeg? Or maybe just how we segmented the sun.
I'd love to know more about your lens calibration. How did you make the table? I thought the error would be most at the top and bttom of the frame and zero in the middle.
Did you have a GPS fix to compare?