A man prepares to press the shutter on h

(ROBYN BECK/AFP/GettyImages)

A man prepares to press the shutter on his camera as he takes a picture of the sunset from The Griffith Observatory in Los Angeles, California June 4, 2012. June 5 will be the first time since 1882 that the Transit of Venus in front of the sun will be seen in the western United States. Since the telescope's invention the Transit of Venus has only been viewable anywhere in the world in the years 1631, 1639, 1761, 1769, 1874, 1882 and 2004, according to NASA's Fred Espenak. AFP PHOTO / ROBYN BECK (Photo credit should read

Venus (top) begins to cross the sun's fa

Venus (top) begins to cross the sun's face during the transit of Venus June 5, 2012 as seen from the west side of Manhattan in New York. Astronomers around the world are training their telescopes on the skies to watch Venus pass in front of the Sun, a once-in-a-lifetime event that will not be seen for another 105 years. AFP PHOTO/Stan HONDA (Photo credit should read STAN HONDA/AFP/GettyImages)

The planet Venus is projected onto a mak

The planet Venus is projected onto a makeshift screen as it transits the Sun on June 5, 2012 in Hudson, Wisconsin. Astronomers around the world are training their telescopes on the skies to watch Venus pass in front of the Sun, a once-in-a-lifetime event that will not be seen for another 105 years. AFP PHOTO/Karen BLEIER (Photo credit should read KAREN BLEIER/AFP/GettyImages)

Venus crosses the sun's face as seen fro

Venus crosses the sun's face as seen from Mexico City on June 5, 2012. Astronomers around the world are training their telescopes on the skies to watch Venus pass in front of the Sun, a once-in-a-lifetime event that will not be seen for another 105 years. AFP PHOTO / OMAR TORRES (Photo credit should read OMAR TORRES/AFP/GettyImages)

Venus is silhouetted as it passes in fro

Venus is silhouetted as it passes in front of the Sun, observed from Akashi in Hyogo prefecture, western Japan on June 6, 2012. Astronomers around the world trained their telescopes on the skies to watch Venus pass in front of the Sun, a once-in-a-lifetime event that will not be seen for another 105 years. AFP PHOTO / Yoshikazu TSUNO (Photo credit should read YOSHIKAZU TSUNO/AFP/GettyImages)

Venus is silhouetted as it passes in fro

Venus is silhouetted as it passes in front of the Sun, observed from Gifu, central Japan on June 6, 2012. Astronomers around the world trained their telescopes on the skies to watch Venus pass in front of the Sun, a once-in-a-lifetime event that will not be seen for another 105 years. AFP PHOTO / KAZUHIRO NOGI (Photo credit should read KAZUHIRO NOGI/AFP/GettyImages)

Venus crosses the sun's face as seen fro

Venus crosses the sun's face as seen from Guadalajara, Mexico on June 5, 2012. Astronomers around the world are training their telescopes on the skies to watch Venus pass in front of the Sun, a once-in-a-lifetime event that will not be seen for another 105 years. AFP PHOTO/Hector Guerrero (Photo credit should read HECTOR GUERRERO/AFP/GettyImages)

8-year-old Alex Olling smiles as he uses

8-year-old Alex Olling smiles as he uses makeshift sunglasses to watch Venus crossing the sun's face on June 5, 2012 as seen from College Park, Maryland. Astronomers around the world trained their telescopes on the skies Tuesday to watch Venus pass in front of the Sun, a once-in-a-lifetime event that will not be seen for another 105 years. AFP PHOTO/Jewel Samad (Photo credit should read JEWEL SAMAD/AFP/GettyImages)

Clouds partially obscure the sun during

Clouds partially obscure the sun during the transit of Venus on June 5, 2012 as seen from College Park, Maryland. Astronomers around the world trained their telescopes on the skies Tuesday to watch Venus pass in front of the Sun, a once-in-a-lifetime event that will not be seen for another 105 years. AFP PHOTO/Jewel Samad (Photo credit should read JEWEL SAMAD/AFP/GettyImages)

A man looks skyward with his safety glas

A man looks skyward with his safety glasses hoping to catch a glimpse of the transit of Venus at Caltech in Pasadena on June 5, 2012 in California. Astronomers worldwide wore safety glasses and trained their telescopes on the skies to watch Venus pass in front of the Sun, a once-in-a-lifetime event that will not be seen for another 105 years, next occuring in 2117. AFP PHOTO/Frederic J. BROWN (Photo credit should read FREDERIC J. BROWN/AFP/GettyImages)

A man looks through a telescope to watch

A man looks through a telescope to watch Venus crossing the sun's face on June 5, 2012 in College Park, Maryland. Astronomers around the world trained their telescopes on the skies Tuesday to watch Venus pass in front of the Sun, a once-in-a-lifetime event that will not be seen for another 105 years. AFP PHOTO/Jewel Samad (Photo credit should read JEWEL SAMAD/AFP/GettyImages)

The planet Venus (black spot on the righ

The planet Venus (black spot on the right) in its transit across the face of the sun is seen from Los Angeles, California on June 05, 2012. Astronomers around the world are training their telescopes on the skies to watch Venus pass in front of the Sun, a once-in-a-lifetime event that will not be seen for another 105 years.AFP PHOTO /JOE KLAMAR (Photo credit should read JOE KLAMAR/AFP/GettyImages)

Venus crosses the sun's face as seen fro

Venus crosses the sun's face as seen from Mexico City on June 5, 2012. Astronomers around the world are training their telescopes on the skies to watch Venus pass in front of the Sun, a once-in-a-lifetime event that will not be seen for another 105 years. AFP PHOTO/Omar Torres (Photo credit should read OMAR TORRES/AFP/GettyImages)

This combo shows pictures taken 30 minut

This combo shows pictures taken 30 minutes apart of Venus passing in front of the lefthandside of the Sun from the city of Akashi in Hyogo prefecture, western Japan on June 6, 2012. Astronomers around the world trained their telescopes on the skies to watch Venus pass in front of the Sun, a once-in-a-lifetime event that will not be seen for another 105 years. AFP PHOTO / Yoshikazu TSUNO (Photo credit should read YOSHIKAZU TSUNO/AFP/GettyImages)

Venus (black dot) is silhouetted as it o

Venus (black dot) is silhouetted as it orbits between the Sun and the Earth during the transit of Venus seen from Bangkok on June 6, 2012. Astronomers around the world trained their telescopes on the skies to watch Venus pass in front of the Sun, a once-in-a-lifetime event that will not be seen for another 105 years. AFP PHOTO / PORNCHAI KITTIWONGSAKUL (Photo credit should read PORNCHAI KITTIWONGSAKUL/AFP/GettyImages)

People watch the planet Venus transit ac

People watch the planet Venus transit across the face of the sun at Griffith Observatory in the Hollywood Hills area of Los Angeles, California June 5, 2012. Astronomers around the world are training their telescopes on the skies to watch Venus pass in front of the Sun, a once-in-a-lifetime event that will not be seen for another 105 years. AFP PHOTO / ROBYN BECK (Photo credit should read ROBYN BECK/AFP/GettyImages)

Planet Venus, pictured as a black dot (a

Planet Venus, pictured as a black dot (at L), is seen in transit across the Sun in New Delhi on June 6, 2012. Sky-gazers around the world held up their telescopes and viewing glasses to watch a once-in-a-lifetime event as Venus slid across the Sun. AFP PHOTO/ MANAN VATSYAYANA (Photo credit should read MANAN VATSYAYANA/AFP/GettyImages)

Planet Venus, pictured as a black dot (a

Planet Venus, pictured as a black dot (at L), is seen in transit across the Sun in New Delhi on June 6, 2012. Sky-gazers around the world held up their telescopes and viewing glasses to watch a once-in-a-lifetime event as Venus slid across the Sun. AFP PHOTO/ MANAN VATSYAYANA (Photo credit should read MANAN VATSYAYANA/AFP/GettyImages)

People use glasses and telescopes on Jun

People use glasses and telescopes on June 6, 2012 to see Venus transit across the Sun at the Obuda observatory in Budapest. Sky-gazers around the world held up their telescopes and viewing glasses on June 6 to watch Venus slide across the sun -- a rare celestial phenomenon that will not happen again for more than 100 years. The spectacle began shortly after 2200 GMT on June 5 in parts of North America, Central America and the northern part of South America, and was seen, with magnification, as a small black dot on the solar surface. AFP PHOTO / ATTILA KISBENEDEK (Photo credit should read ATTILA KISBENEDEK/AFP/GettyImages)

Planet Venus is seen as a black dot as i

Planet Venus is seen as a black dot as it transits across the Sun during sunrise in Sofia on June 6, 2012. Sky-gazers around the world held up their telescopes and viewing glasses on June 6 to watch Venus slide across the sun -- a rare celestial phenomenon that will not happen again for more than 100 years. The spectacle began shortly after 2200 GMT on June 5 in parts of North America, Central America and the northern part of South America, and was seen, with magnification, as a small black dot on the solar surface. AFP PHOTO / NIKOLAY DOYCHINOV (Photo credit should read NIKOLAY DOYCHINOV/AFP/GettyImages)

Venus is seen as a dot as it transits ac

Venus is seen as a dot as it transits across the Sun on June 6, 2012 outside Sarajevo. Sky-gazers around the world held up their telescopes and viewing glasses on June 6 to watch Venus slide across the sun -- a rare celestial phenomenon that will not happen again for more than 100 years. The spectacle began shortly after 2200 GMT on June 5 in parts of North America, Central America and the northern part of South America, and was seen, with magnification, as a small black dot on the solar surface. AFP PHOTO / ELVIS BARUKCIC (Photo credit should read ELVIS BARUKCIC/AFP/GettyImages)

The planet Venus, pictured as a black do

The planet Venus, pictured as a black dot (top L), is seen in transit across the sun as seen from Rafah town in the southern Gaza Strip on June 6, 2012. Sky-gazers around the world held up their telescopes and viewing glasses to watch a once-in-a-lifetime event as Venus slid across the sun. AFP PHOTO/ SAID KHATIB (Photo credit should read SAID KHATIB/AFP/GettyImages)

Venus (L) viewed as a small black dot, p

Venus (L) viewed as a small black dot, passes across the sun as seen from a weather observatory in Manila on June 6, 2012. Sky-gazers around the world held up their telescopes and viewing glasses June 6, to watch Venus slide across the sun -- a rare celestial phenomenon that will not happen again for more than 100 years. Other small dots on the right of the photo are called sun spots. AFP PHOTO/TED ALJIBE (Photo credit should read TED ALJIBE/AFP/GettyImages)

Venus (L) viewed as a small black dot, p

Venus (L) viewed as a small black dot, passes across the sun as seen from a weather observatory in Manila on June 6, 2012. Sky-gazers around the world held up their telescopes and viewing glasses June 6, to watch Venus slide across the sun -- a rare celestial phenomenon that will not happen again for more than 100 years. Other small dots on the right of the photo are called sun spots. AFP PHOTO/TED ALJIBE (Photo credit should read TED ALJIBE/AFP/GettyImages)

Skywatchers, who gathered to witness the

Skywatchers, who gathered to witness the transit of Planet Venus, look through protective eyewear in a futile wait for a break in the clouds during overcast skies in Mumbai on June 6, 2012. Sky-gazers around the world held up their telescopes and viewing glasses to watch a once-in-a-lifetime event as Venus slid across the Sun. AFP PHOTO/ Indranil MUKHERJEE (Photo credit should read INDRANIL MUKHERJEE/AFP/GettyImages)

A picture taken from the Israeli coastal

A picture taken from the Israeli coastal Mediterranean city of Tel Aviv shows the transit of Venus across the face of the sun on June 6, 2012. This rare astronomic event occurs in pairs, about eight years apart, roughly once a century. The most recent Venus transit was in 2004, it will not happen again until 2117. AFP PHOTO / JACK GUEZ (Photo credit should read JACK GUEZ/AFP/GettyImages)

Pakistani students watch the transit of

Pakistani students watch the transit of Planet Venus across the sun using welder's masks for eye protection in Lahore on June 6, 2012. Astronomers around the world trained their telescopes on the skies to watch Venus pass in front of the Sun, a once-in-a-lifetime event that will not be seen for another 105 years. AFP PHOTO / Arif ALI (Photo credit should read Arif Ali/AFP/GettyImages)

Venus (top R) viewed as a small black do

Venus (top R) viewed as a small black dot, passes across the sun as seen middle clouds in the sky of Rome early on June 6, 2012. Sky-gazers around the world held up their telescopes and viewing glasses June 6, to watch Venus slide across the sun -- a rare celestial phenomenon that will not happen again for more than 100 years.The spectacle began shortly after 2200 GMT on June 5 in parts of North America, Central America and the northern part of South America, and was seen, with magnification, as a small black dot on the solar surface. AFP PHOTO / ANDREAS SOLARO (Photo credit should read ANDREAS SOLARO/AFP/GettyImages)

An Indian Saddhu (holy person) watches t

An Indian Saddhu (holy person) watches the transit of Planet Venus across the sun with protective eyewear in Guwahati on June 6, 2012. Sky-gazers around the world held up their telescopes and viewing glasses to watch a once-in-a-lifetime event as Venus slid across the Sun. AFP PHOTO/STR (Photo credit should read STRDEL/AFP/GettyImages)

Planet Venus (R-black spot) transits in

Planet Venus (R-black spot) transits in front of the Sun seen from the Observatory of Obuda, in Budapest on June 6, 2012. Astronomers and novice star-gazers worldwide trained their eyes and telescopes on the skies on June 6 for the last chance this lifetime to observe Venus track a near seven-hour path across the Sun. The event, only to be seen again in 105 years, began shortly after 2200 GMT on Tuesday, visible first from the Pacific and north and central Americas as a small black dot trailing across the solar surface. AFP PHOTO / LAJOS DENES (Photo credit should read ATTILA KISBENEDEK/AFP/GettyImages)