Transits of Mercury are occuring more often than transits of Venus at irregular intervalls of 3.5 to 13 years. On this day half our globe will be able to watch the tiny black dot of the planet Mercury moving across the disc of the sun. Given a cloudless sky, you'll need binoculars or a small telescope and a sun filter to follow the spectacle for several hours. The previous transit of Mercury occurred on November 15, 1999.

 

Mercury	History and Astronomy
Conjunctions and Transits	online computing by JavaScript
Transits	When and how often does a Venus transit happen ? Recent and future transits of Mercury
1999, November 15
2003, May 7	Details about the transit
Applet:	Mercury Transit Observer
Applet	Phases of Mercury and Venus
Applet	Planetary Motion

 

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