The full moon of today, November 21, is called blue moon. It should be noted that blue moon would not actually be blue in color. The moon is only blue in name, not in color. The moon tonight will be the 3rd of the 4 full moons in a season. This is the reason that it is called blue moon.
By one contemporary description, a blue moon is the 2nd full moon in a year. According to this explanation, the second blue moon will draw closer to sight on August 31, 2012.
According to the calendar of the Maine Farmers, 3 full moons appear normally in one season, 3 in summer period and 3 in autumn. When it comes to blue moon, one season means the phase linking an equinox and a solstice or the other way around.
Thus, the full moon of today is a blue moon. Today’s blue moon is the 3rd full moon of this season’s 4 full moons. It should be noted that the creators of calendar name each full moon on the basis of the full moon's position as compared to that year’s 2 equinoxes and 2 solstices. It is quite convenient for the makers of calendar to name the 3rd, rather the 4th full moon a blue moon.
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