Lunar "X", man!

 Once a month on a clear night when the Moon is visible there is an illusion of an "X" on the terminator of the Moon. The moon's terminator is the dividing line marking the edge between day and night on the moon. It's sometimes called the twilight zone, because it marks where the sun is either rising or setting on the moon and so – along the terminator line – the moon's landscape is in a twilight state.

On one small area of the terminator several craters meet each other in such a way that the light along the terminator creates the illusion of an "X".

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