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How does a laser-ranging device work?

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A global network of observation stations measures the round trip time of flight of ultrashort pulses of light to satellites equipped with retroreflectors.
powerful source of data for studies of the solid Earth and its ocean and atmospheric systems

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26. If it is noon, solar time, at 70°W longitude, what is the solar time at each of the following locations? 72 W longitude: 65°

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Answer:

If it is noon time at 70 degree west longitude, The solar time at 72 degree west longitude would be 12:08 p.m., at 65 degree west longitude time would be 11:40 a.m., at 90 degree west longitude the time would be 12:40 p.m. and at 110 degree east longitude the solar time would be 00:00 midnight. This has been calculated with the formula that one degree is equal to 4 minutes.