To find the time meridian of a country, take the westernmost longitude and the easternmost longitude of that country, take the mean, and find the nearest multiple of 7.5 degree. AsIndia's longitudinal extent is from 68° 7' 53" E to 97° 24' 47" E. The mean comes out to be 82°46'20".
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Because one day is 24 hours long one can easily use time to calculate longitude. One hour of time difference corresponds to 15° of longitude (360°/24 hours = 15°/hour). Suppose an observer sets his accurate watch to 12:00 at noon in Greenwich, England and then travels a great distance.
apparent deflection is called the "coriolis force" and is a result of the earth's rotation. as air moves from to low pressure in the northern hemisphere, it is deflected to the right by the coriolis force
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