An outline plot of the Moon was made including a selenographic grid 
at 10( intervals and crater circles whose coordinates and radii were 
obtained from the Lunar Prospector Web site. The plot was generated 
for the lunar librations at Mt. Airy, MD, at 4:46 U.T. of 1999 Nov. 
18, and was copied to a transparency. This was first fitted to a 
video image showing large craters near the terminator to determine 
the scale and orientation, as shown below. Then, the grid could be 
sized and oriented to fit to the edge of the Moon in the view of the 
D Impact to the right. In this view, ten frames including the impact 
have been averaged, and the result computer-processed to show 
intensity variances that enhances the lunar dark limb. The scale of 
the two views is different.