Baily's Beads near Solar Eclipse Totality
			
		
		
			Credit & Copyright:  
Leonid Durman
		
		
			Just before the Sun blacks out, something strange occurs.
As the Moon moves to completely cover the Sun in a 
total solar
eclipse, beads of bright sunlight stream 
around the edge of the Moon.
This effect, known as 
Baily's beads,
is named after 
Francis Baily 
who called attention to the 
phenomenon
in 1836.  
Although, the number and brightness of 
Baily's beads used to be unpredictable,
today the Moon 
is so well mapped that general features regarding Baily's beads are expected.
When a single bead dominates, it is called the 
diamond ring effect,
and is typically seen just before totality.  
Pictured above, a series of images recorded Baily's beads at times
surrounding the recent total solar eclipse
visible from 
Novosibirsk, 
Russia.
The complete series can be seen by scrolling right.
At the end of totality, as the Sun again emerges from behind the moon, 
Baily's beads
may again be visible -- but now on the other side of the Moon.