laser ranging
  • Use of lasers for precise distance finding. On Earth, surveyors and others use lasers as accurate, rapid tape measures which need not be stretched between the points whose separation is being measured. In astronomy they are used by reflecting light from special mirrors on satellites and on the Moon. laser methods have allowed the Moon’s orbit and rotation to be determined a hundred times more accurately than before and have provided evidence suggesting that the Moon may still be vibrating from a major meteorite impact a few centuries ago.
  • The use of a laser to determine the precise distance to objects. For instance, the time required for a laser beam to be reflected off an object can be utilized to calculated its distance.

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