When the moon blocks sunlight from reaching a portion of the earths surface?

When the moon blocks sunlight from reaching a portion of the earths surface?
Sebastian Vargas Answered Last
It's a solar eclipse. The next one is scheduled for sometime in 2012
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How long does sunlight take to reach earth?

This varies with the Earth's distance from the Sun, but it takes the light from the Sun between 8 and 8 1/2 minutes to reach the Earth.

Thanks for the feedback!