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Credit & Copyright: Ronald F. Dantowitz     
(The Clay Center)   
   
Explanation:
Today an astronomical event will occur that no living person has ever seen:    
Venus will cross directly in front of the Sun.     
   
A Venus crossing, called a transit, last occurred in 1882 and was    
front-page    
news    
around the world.   
   
Today's transit will be visible in its entirety throughout    
Europe and most of Asia and Africa.     
   
The northeastern half of    
North America will see the Sun rise with the    
dark dot of Venus already superposed.     
   
Never look directly at the Sun, even when    
Venus is in front.     
   
Mercury's closer proximity to the Sun cause it to transit every few years.     
   
In fact, the above image mosaic of Mercury    
crossing the Sun is from    
two    
transits    
ago, in November 1999.      
   
Will anyone living see the next Venus transit?  Surely yes since it occurs in 2012.   
   
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NASA Web Site Statements, Warnings, and Disclaimers
NASA Official: Jay Norris. Specific rights apply.
A service of: LHEA at NASA / GSFC
& Michigan Tech. U.
Based on Astronomy Picture
Of the Day
  