Blue photos on Flickr

In fact, "blue moon" refers not to color, but to rarity. Blue moons are defined as either the fourth full moon in a season, or, more recently, as the second full moon in a month. It's the second definition that covers August's blue moon; the month's first full moon was on Aug. 1.

Blue moons happen because our calendar months don't precisely sync with the moon's orbit. It takes the moon 29.5 days to wax and wane from full to new to full again. With the exception of February, months are longer than that, meaning that once in a while the timing works out so there are two full moons in one month.

Blue moons are best known from the phrase "once in a blue moon," meant to refer to something extremely rare. Two blue moons in a month aren't all that unusual, however; they occur 2.7 years apart on average, though not with great regularity. The last blue moon occurred on Dec. 31, 2009. That "New Year's Eve Blue Moon" also coincided with a partial lunar eclipse for viewers in Europe, Asia, Africa and some parts of Alaska.

Another truly rare event is a year with two blue moons. The last time a single year had two months with two full moons was in 1999. The next time double blue moons will occur is in 2018.

The Tint was done to have a BLUE LOOK

Blue House Lagoon by Murray Hadley

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HDR: PHotomatix 3exp Compr .7901(123)-Edit copy

Click 'til Large!

Blue Bird by J D

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Blue Butterwort-Profile by Bob Peterson

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Blue Butterwort (Pinguicula caerulea) along a trail at Jonathan Dickinson State Park, Martin County, Florida. There were also Yellow Butterwort in the area. No color enhancement, the flower is actually somewhat bluer than this. This one is carnivorous!

Here is the plant with her sticky insect-catching leaves:

www.flickr.com/photos/pondapple/5296581164/

container by maarten nielsen gerlach

blue flowers by Boris B

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Blue and bark by Mark Salmon

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Spring in Abbey Woods outside Shrewsbury

Feeling Blue by concross1

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Last few days,have not been feeling that great.Finally,went out today.Got to get my "Photogrove" back.

blue engine by Marc Davies

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Blue Magic by bazmoore4

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Common Blue by Deirdre Murphy

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The Blue Glove. by Jérôme Cousin

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(March 2013)

Blue flowers by Bayubadu

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blue concept by erkua

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