Blue moon in Gaza City
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Rare blue moon appears Friday

Blue moon in Gaza City
A full moon is seen from Gaza City on Aug. 31, 2012. According to NASA, this is the second time in this month that a full moon is seen -- the first was Aug. 1 to 2. This phenomenon, which is referred to as the blue moon, happens every two and a half years on average.  (Mohammed Abed / AFP/Getty Images)
Blue moon in Bhubaneswar, India
A village boy rides his bicycle on sand as a blue moon shines on the outskirts of the eastern Indian city of Bhubaneswar on Friday.  (Biswaranjan Rout / Associated Press)
Blue moon in Macedonia
A full moon is seen behind the neon cross of a church in Skopje, Macedonia, on Friday.  (Robert Atanasovski / AFP/Getty Images)
Blue moon in Macedonia
A full moon is seen through tree branches in Skopje, Macedonia, on Friday.  (Robert Atanasovski / AFP/Getty Images)
Blue moon in Athens
A full moon shines above the Acropolis hill in Athens.  (Louisa Gouliamaki / AFP/Getty Images)
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