A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Robin Stuart
Date: 2022 Jan 20, 06:46 -0800
Actually the existence of 2 solutions is to be expected. Besselian elements are a standard method for analyzing eclipses and occulations. This approach uses the view of the the Earth and Moon as seen from the star. The first attached image shows the Earth and Moon at 11:05:48 UT. The gray disk represents the Moon and the red dot is the geographical position (GP) of Zubenelgenubi. Observers on the Earth's surface located around the limb will be seeing Zubenelgenubi disappear or reappear from the occultation. The second image is for 12:27:22 UT. The Moon's limb projected on the Earth's is not, in general, a circle but we would expect that the two curves would intersect at two points and generate two possible solutions to this problem.