Thursday, May 3, 2012

Blue Moon


We know well that what is new moon and full moon.  There is also a peculiar term ‘blue moon’ quoted frequently.  What is that? 

 
A "blue moon" is also used, colloquially, to mean "a rare event", reflected in the phrase "once in a blue moon".  So  ‘blue moon’ must be a rare occurrence!!
In reality, a blue moon is not that rare but happens once in every three years.  The time between two full Moons doesn't quite equal a whole month (from new Moon to new Moon is 29.5 days),the remaining days are accumulated over a period of three years and thus approximately every three years there will be two full Moons in one calendar month. 

The next time two full Moons that occur in the same month will be in August 2012.So folks be prepared to welcome the blue moon in august this year.