Lunar X

~ Lunar X ~

Several times a year, for a few hours near its first quarter phase, a feature on the moon called the Lunar X becomes visible in strong binoculars and backyard telescopes. When the rims of the craters Purbach, la Caille, and Blanchinus are illuminated from a particular angle of sunlight, they form a small, but very obvious X-shape. This event should be visible anywhere on Earth where the moon is shining in a dark sky during that time window.

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