BRAZIL-BLUE-MOON-FEATURE

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The full moon rises over Rio de Janeiro on August 31, 2012. According to NASA, this is the second time in August that a full moon is seen - the first was on August 1 to 2. This phenomenon, which is referred to as the 'blue moon', happens every two and a half years on average.

MACEDONIA-BLUE-MOON

ROBERT ATANASOVSKI/AFP/GettyImages

A full moon is seen from Skopje on August 31, 2012. According to NASA, this is the second time in August that a full moon is seen - the first was on August 1 to 2. This phenomenon, which is referred to as the 'blue moon', happens every two and a half years on average.

US-TOURISM-REFLECTING POOL-MOON

KAREN BLEIER/AFP/GettyImages

The Washington Monument, US Capitol and the "Blue" Moon (2nd full moon of the month) are reflected in the newly refurbished Reflecting Pool August 31, 2012 on the National Mall in Washington, DC. The Reflecting Pool reopened August 31, 2012 after a two-year, USD34 million reconstruction. The pool has been reengineered with a circulation and filtration system. Instead of using city drinking water, it draws river water from the nearby Tidal Basin, which will save 20 million gallons of drinking water each year. The pool is shallower ? only 3 feet at its deepest point ? to save water, and its bottom is tinted gray to make the water darker and more reflective of the 555-foot-tall Washington Monument.

BRAZIL-BLUE-MOON-FEATURE

VANDERLEI ALMEIDA/AFP/GettyImages

An airplane flies over Santos Dumont domestic airport in Rio de Janeiro on August 31, 2012 as the full moon shines in the night sky. According to NASA, this is the second time in August that a full moon is seen - the first was on August 1 to 2. This phenomenon, which is referred to as the 'blue moon', happens every two and a half years on average. AFP PHOTO/VANDERLEI ALMEIDA

GREECE-MONUMENT-BLUE-MOON

LOUISA GOULIAMAKI/AFP/GettyImages

Greeks and tourists visit at the Roman Agora in Athens which is open all night as part of a full moon celebration on August 31, 2012. A number of archaeological sites and museums around Greece opened at night with events and concerts celebrating the second full moon of August, known as 'blue moon'.

GREECE-MONUMENT-BLUE-MOON

LOUISA GOULIAMAKI/AFP/GettyImages

Greeks and tourists attend a concert at the Roman Agora in Athens as part of a full moon celebration on August 31, 2012. A number of archaeological sites and museums around Greece opened at night with events and concerts celebrating the second full moon of August, known as 'blue moon'.

MACEDONIA-BLUE-MOON

ROBERT ATANASOVSKI/AFP/GettyImages

A full moon is seen behind the neon cross of a church in Skopje on August 31, 2012. According to NASA, this is the second time in August that a full moon is seen - the first was on August 1 to 2. This phenomenon, which is referred to as the 'blue moon', happens every two and a half years on average.

Cincinnati Remembers Armstrong Under A 'Blue' Moon

NASA/Bill Ingalls

A rare second Full Moon of the month, known as a "Blue Moon", is seen over Cincinnati on Friday, Aug. 31, 2012. The family of Apollo 11 Astronaut Neil Armstrong held a memorial service celebrating the his life earlier in the day in Cincinnati. Armstrong, the first man to walk on the moon during the 1969 Apollo 11 mission, died Saturday, Aug. 25. He was 82.

GAZA-BLUE-MOON

MOHAMMED ABED/AFP/GettyImages

A full moon is seen from Gaza City on August 31, 2012. According to NASA, this is the second time in this month that a full moon is seen - the first was on August 1 to 2. This phenomenon, which is referred to as the 'blue moon', happens every two and a half years on average.

GAZA-BLUE-MOON

MOHAMMED ABED/AFP/GettyImages

A full moon is seen from Gaza City on August 31, 2012. According to NASA, this is the second time in this month that a full moon is seen - the first was on August 1 to 2. This phenomenon, which is referred to as the 'blue moon', happens every two and a half years on average.

MACEDONIA-BLUE-MOON

ROBERT ATANASOVSKI/AFP/GettyImages

A full moon is seen behind tree branches in Skopje on August 31, 2012. According to NASA, this is the second time in August that a full moon is seen - the first was on August 1 to 2. This phenomenon, which is referred to as the 'blue moon', happens every two and a half years on average.

BRAZIL-BLUE-MOON-FEATURE

VANDERLEI ALMEIDA/AFP/GettyImages

An airplane lands at Santos Dumont domestic airport in Rio de Janeiro on August 31, 2012 as the full moon shines in the night sky. According to NASA, this is the second time in August that a full moon is seen - the first was on August 1 to 2. This phenomenon, which is referred to as the 'blue moon', happens every two and a half years on average.

GREECE-MONUMENT-BLUE MOON

LOUISA GOULIAMAKI/AFP/GettyImages

A picture taken on August 31, 2012 shows a full moon, the second in August also called 'blue moon', above the ancient Acropolis hill in Athens.

BRAZIL-BLUE-MOON-FEATURE

VANDERLEI ALMEIDA/AFP/GettyImages

An airplane prepares to land at Santos Dumont domestic airport in Rio de Janeiro on August 31, 2012 as a full moon shines in the night sky. According to NASA, this is the second time in August that a full moon is seen - the first was on August 1 to 2. This phenomenon, which is referred to as the 'blue moon', happens every two and a half years on average.