With this interactive moon phase calendar, you can choose a month and year and see why lunar months aren’t an exact match with calendar months.
Step outside! Keep track of the moon in your night sky, and chart the changes yourself. See our tips on how to chart the moon in the sky and explore the phases of the moon over the course of its 29.53-day cycle. In the process, you’ll discover why lunar months aren’t an exact match with calendar months.