>From one Full Moon day to another is normally a period of 28/29 days called a Lunar Month. A calendar month has 30/31 days, therefore a Full Moon Day can occur normally once in a calendar month. However, it so happens that in current month of December '09 there are two Full Moon days i.e. Dec 2nd and Dec 31st and the second Full Moon in
a calendar month is known as the Blue Moon which falls this year on the New Year' Eve. In other words New Year Day 2010 begins in Blue Moon night which is a very rare occurrence , possibly once every 19 years, hence the expression ''once in a blue moon'' The event has no astronomical significance but astrologers may see it differently. Another interesting fact for us in India, is that a Lunar Eclipse is taking place as well on this Blue Moon night i.e. 12.30 am to 01.30 am. of January,1st,2010.
