You are here: Home » International » News » Others
Business Standard

Astronomers seize last chance in lifetime for Venus Transit

Rarest event in Solar System: an alignment of Earth, Venus and the Sun

AFP/PTI  |  Paris 

I / Paris May 26, 2012, 13:54 IST

are gearing for one the rarest events in the Solar System: an alignment of Earth, and the that will not be seen for another 105 years.

The ballet known as the of is one of the most eagerly-awaited events in skywatching, an episode that has advanced the frontiers of knowledge, sometimes with dramatic consequences.

"For centuries, the of has been one of the great moments for astronomers," said Claude Catala, head of the "2012 will not be an exception to the rule. It is a one-off opportunity."

"It's now or never," the British magazine Physics World told its readers.

"It will be an event well worth watching, as the next of Venus will not occur until December 2117, when most of us will be long gone."

In a transit, Venus passes between and the Sun, appearing through the telescope as a tiny black spot that, for some six and a half hours, crawls in a line over the fiery face of the

On the evening of June 5, North America, Central America and the northern part of South America will get to see the start of the transit -- clear skies permitting -- until those regions go into sunset.

All of the transit will be visible in and the Western Pacific. Europe, and will get to see the end stages of the eclipse as they go into sunrise on June 6. But West and Southwest Africa, and most of South America, will not get a view, although people there can catch the event on a webcast. Only six Transits of Venus have ever been recorded -- quite simply because before the phenomenon was predicted by the 17th-century German mathematician Johannes Kepler, no-one knew where to look or had the lenses to do so. Transits occur in truly weird combinations, either in a June or a December.

When one happens, another one happens in the same month eight years later. Then there is a wait. A very long wait. A pair of December transits follows a June pair after 105 years, while a June pair comes 121 and a half years after a December pair. For example, there was a transit in December 1882; the next one was in June 2004, which will be followed this year on June 5-6, depending on the dateline; will then have to be patient until December 2117, which will be followed by another transit in December 2125.

First Published: Sat, May 26 2012. 13:54 IST