A Blue Moon is said to occur when there are two full moons in one calendar month. Americans had a blue moon on May 31st, with the first full moon of the month being May 2nd). Owing to time zone differences, Europeans are enjoying a blue moon tomorrow on June 30th. This phenomenon doesn't occur often, thus giving rise to the phrase "once in a Blue Moon" - find out about future occurances using a Blue Moon calculator. - via
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More importantly... look at the full moon today. And look at Jupiter, and Venus and Saturn in conjunction..close to each other...the really bright Venus and the small dot next to it is Saturn..
This page gives more details..
Night Sky Note for June 30, 2007Saturday, June 30, 2007
Venus passes 0.7° to the south of Saturn. This is the best pairing of naked-eye planets this year. At 0.7°, both planets should fit into the field of view of a telescope with a wide field eyepiece. Venus is a 36% crescent. Saturn's rings are tipped 13°. Look with the telescope while the sky is still blue to get a better look at Venus' crescent shape. The Moon, which turned Full at 9:49 am EDT, will be rising in the southeast.
Night Sky Note for June 29, 2007Friday, June 29, 2007
Venus and Saturn are about 1° apart. Look to the west in the evening.
The asteroid "17059 Elvis" makes its closest approach to the Earth. Today, Elvis is only 135 million miles from the building. The asteroid, named to honor the King of Rock and Roll, was discovered in 1999. It's a main-belt asteroid orbiting the sun between Mars and Jupiter. 17059 Elvis is much too faint to see without a large telescope and a good finder chart.