This week in Starwatch I want to go back to basics when it comes to the moon. So why does the moon change shape? Why is it a crescent on one night, a half-moon another night, and a full moon on yet ...

Moon phases reveal the passage of time in the night sky. Some nights when we look up at the moon, it is full and bright; sometimes it is just a sliver of silvery light. These changes in appearance are ...