Can two full moons occur in the same month?
Our master clock is the sky. We reckon tine from the sun, the moon and the stars as they wheel across the heavens. But these pointers do not keep in step with each other. There are not an even number of months in a year, and there are about 365 days in a year. Most calendar months have only one full moon. But in 1963, the moon will be full on nov. 1 and again on nov. 30. Every three years or so, we have two full moons in a calendar month, and this has happened only 20 times in the 20th century. Our calendar months vary in length from 28 to 31 days, and the changing moon does not fit into this system at all. The period of time between one full moon and the next is about 292 days. There are 12 full moons every 354days, and the calendar year is 365 days or 11 days longer than 12 lunar months. The year is based on the time it takes the earth to travel its 600 million mile orbit around the sun. A day, from midnight to mignight, is the time it takes the earth to rotate once on its axis. But
