Perigee First Quarter Moon

I imaged the Moon twice, today, but it was not until I checked the details afterwards that I realised I had, on my second run, inadvertently captured the Moon within about 8 km (15 minutes) of perigee, so about the largest it will appear. Mirroring the first image (on the left) allows small differences in detail to be seen along the terminator in the space of just 3 hours.

All the technical data for the Moon is on the image. The two horizontal lines mark the top and bottom of the perigee Moon and a difference can be seen under the other Moon. On the original images this amounts to approximately 5 or 6 pixels which is in reasonable agreement with the calculated 7 pixels difference for the quoted angular sizes.

Focal Length: 1200 mm
Exposure (left): f/5.9, 1/125s, ISO-100
Exposure (right): f/5.9, 1/40s, ISO-100

Nikon D800
Skywatcher 200P

GIMP: Adjust levels, sharpen and combine two images, mirroring one, add lines for comparison.