Lunar Trivia Today (Fri 13th)

It's not quite a full moon. The moon is 9% effaced and the gibbous moon is waning. A gibbous moon is one of the phases of the moon, when the size of the illuminated portion is greater than half but not a full moon. The period between a first quarter moon and a full moon is known as a waxing gibbous moon, because the illuminated region of the Moon is increasing from day to day. After it becomes a full moon, but hasn't reached the last quarter, the moon is called a waning gibbous moon.