NASA Astrophysics Data System [ http://adswww.harvard.edu ]

Space Place [ http://spaceplace.jpl.nasa.gov ]

Hands-On Universe [ http://www.handsonuniverse.org ]

SkyView [ http://skyview.gsfc.nasa.gov ]

Bad Astronomy [ http://www.badastronomy.com ]

Nick Strobel's Astronomy Notes [ http://www.astronomynotes.com ]

PlanetDiary [ http://www.planetdiary.com ]

Sea and Sky [ http://www.seasky.org ]

AbsoluteAstronomy.com [ http://www.absoluteastronomy.com ]

Know More About Blue Moon [ http://www.moon-eyes.com ]
Put in simple words the concept of blue moon signifies the occurrence of two full moons in one single calendar month. If we talk in terms of logistics it can be said blue moon is a rare occurrence which can be seen only once in a span of 2.5 years.It has been observed that chances of a blue moon occurring on the New Year's Eve is all the more a distant possibility and has probability of emerging once in 19 years.