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Longitude Longitude is the angular distance (expressed in degrees) East or West of the prime meridian, which goes from the North Pole to the South Pole through Greenwich, England. Arcs of 1° longitude are 110 km apart at the equator, and therefore 15° arcs subtend 15 (110) km, or 1650 km, at the equator.
Because Earth rotates 15° per hr, longitude is found by taking the difference between time zones multiplied by 15°. For example, if it is 12 noon where we are (in the United States) and 5 p.m. in Greenwich, we are located at longitude 5(15°), or 75° W.
(a) What is the longitude at Greenwich, England?
(b) Use time zones to determine the longitude where you live.
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Chapter 3 Solutions
Trigonometry plus MyLab Math with Pearson eText -- Access Card Package (11th Edition)
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