On New Year's Eve, 2009, earthlings experienced an "astronomical phenomenon" - a blue moon.
As dawn approached, I found myself preparing to travel by air from San Antonio, Texas to Portland, Maine.
As I walked to my terminal, this is the sight that welcomed me through the airport windows.
A Blue Moon is the name given to a full moon that occurs twice in one month. Through the centuries, a Blue Moon has had numerous definitions. According to the Farmer's Almanac, a Blue Moon is an extra full moon that occurred in a season, each season having 3 full moons. But a misinterpretation in the 1940's defined it as we now know it.
Because the monthly calendar was built on the lunar cycle of 29.5 days, there is usually only one full moon every month. But once every 2-1/2 years, those extra half days add up to two full moons in a month.
The last time a Blue Moon occurred on New Year's Eve was in 1990. The next time the night sky will host this event will be in 2028, at which time a total lunar eclipse will be visible from some locations in the world.
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