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					 Suppose if we measure the time lapse between the two Sunsets by sitting in the beach, from this we can estimate
 
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                        -  The distance between the sun and the earth
 
-  The depth of the ocean
 
-   The radius of the earth
 
- The radius of the sun
 
-  The distance between the sun and the earth
Correct Option: C
A method is described whereby, using primitive equipment anyone can measure the size of the earth to an accuracy of order of magnitude 10% by observing two sunsets in the space of a few seconds.
 
	