Hi Peter,
Here’s an inverted plot of the lunar limb generated by Occult from LRO/LOLA data. It’s for the location of Cirencester at 09:50 UT on 2022 October 25 to compare with James Weightman’s ‘Lunar Mountains Silhouette’ image.
https://britastro.org/observations/observation.php?id=20221025_124443_d85bceb02058323a
Note that the Occult plot has a linear baseline, whereas the lunar limb is curved.
I might not have used the correct limb angle in Occult, and as you view the limb in fine detail any discrepancy in the site location and altitude, or error in selecting the cusp angle, can cause a significant difference in the resulting limb profile.
Alex.
