I / Paris May 26, 2012, 13:54 IST
The celestial ballet known as the Transit of Venus 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 Transit of Venus has been one of the great moments for astronomers," said Claude Catala, head of the Paris Observatory. "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.
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.
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; astronomers will then have to be patient until December 2117, which will be followed by another transit in December 2125.