The Moon is at last quarter tonight. It is three-quarters of the way through its monthly cycle of phases, so it lines up at a right angle to the Earth-Sun line. At that angle, sunlight illuminates half of the lunar hemisphere that faces our way.
The Moon is at last quarter tonight. It is three-quarters of the way through its monthly cycle of phases, so it lines up at a right angle to the Earth-Sun line. At that angle, sunlight illuminates half of the lunar hemisphere that faces our way.