Fascinating features on the Moon last night!

The Lunar X and V are lighting effects when light and shadow produce the appearance of a letter 'X' on the rim of the crater Blanchinus and a 'Y' by the crater Ukert. The effect is only visible for a few hours before the Moon reaches first or last quarter. So if you didn't see it last night, you've got a fortnight to wait! (Click to enlarge!)