Hindus believe that the cosmic rays that radiate to the earth during the Solar and Lunar eclipses would affect the Human beings.
They have Mantras to be recited during this period..
The eclipses are divided into three parts, Beginning, Middle and the portion from the middle to the end.
Mantras recited during this period will give the thousand fold effect for any Mantra.
Any good deed performed will yield results in a similar way.