Showing posts with label Space. Show all posts
Showing posts with label Space. Show all posts

Saturday, July 14, 2012

Day and night cycles on Earth



We live on Earth depending mostly on daylight. After sunset we stop our main activities, take rest and go to sleep at night. This refreshes, repairs or rejuvenates us for the next day activities. These daily activities prolong our life on Earth. How these day and night are formed in a day's time?

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