Sunset on the 19-day moon and the terminator is closing in on Mare Nectaris, accentuating the wrinkle ridges on the basin floor. Fracastorius spills over its southern border, lesser craters encircling upwards and around to Beaumont (at the 8 o'clock position), the overlapping pair of Theophilus and Cyrillus (10 o'clock), Madler (11 o'clock), the almost fully engulfed remnants of Daguerre (12 o'clock), finally to meet Montes Pyrenaeus (Pyrenees Mountains) along the eastern front.
This is a single 0.7 second ISO 100 image that was taken at the end of a Mars session on18-Jul-2003 as the clouds began to roll in. Captured with an 8" Mak-Newt and Canon 10D digital SLR through a stacked pair of TeleVue Powermates (2x and 4x). The original image is 3072 x 2048 pixels and has been reduced (4x4 binned) for display here.
Processing done in Images Plus and final polish with Adobe PhotoShop.