We once used to embrace a 13-month calendar, and some cultures still follow this format. So why are they 12 months instead of 13?

The full moon, the period when the moon is at its largest and brightest, is merely one part of the lunar cycle, which is approximately one month in length. While the full moon can be seen globally ...

The full moon ... months. They are also most visible when a full moon is surrounded by thin cirrus clouds. Here is when you ...