Tonight marks the First Quarter Moon, when roughly half of the Moon’s visible face is illuminated. As of Saturday, May 23, ...

Here's when to see a pair of massive letters shining on the lunar surface around May's first quarter moon phase.

On May 22, the moon will reach its first quarter phase in the meticulous and resourceful sign of Virgo ...

Long before the full moon rises, shifting sunlight transforms the lunar surface into one of the sky's best telescope targets.