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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

  • A.The distance between the sun and earth
  • B.The depth of the ocean
  • C.The radius of the earth
  • D.The radius of the sun

Answer: C

Timing the interval between two sunsets - one seen lying down on the beach and the second after standing up - gives the radius of the earth.

Raising the eye by a known height lets you see a little further over the curve, and the extra delay before the sun sets again depends on how sharply the surface curves. The geometry then yields the earth's radius.

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