A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Robin Stuart
Date: 2021 Dec 22, 11:43 -0800
I don't follow why you would want a gnomonic projection for, as you deftly pointed out in this thread, it is not conformal and hence the angles measured on the image don't translate into angles on the map. I do think that it would in principle be possible to compute curves of constant azimuth difference between pairs of stars from your measurements but I am not sure the level of accuracy you'd get.
Based on the surrounding buildings seen in the original I think the tower on which the owl was sitting can be seen sticking up at the end of the left hand road in the attached photo. It can be seen from above here,