According to my RASC calendar, the “Lunar X” will be visible on the moon tonight around 11:00 pm. Hope the clouds hold off long enough so I can take a picture!!! The “Lunar X” appears for a brief time around first quarter moon when the sun illuminates the edges of some craters, making an “x” shape. This appears along the moon’s terminator (the line that separates the illuminated part of the moon from the uniluminated side), about 1/3 of the way up from the bottom edge of the moon. It “may” be visible in binoculars, although I’ve never tried to see it with them.
Here is a link to some great photos of this lunar feature: http://www.astropix.com/HTML/SHOW_DIG/Lunar_X.HTM
Update: Clouds moved in about 10:00pm, but I managed to catch the beginning of the Lunar X’s appearance. You can see it in the cropped photo below. The X is near the bottom of the photo and is just visible against the dark background.
