If the distance between two longitudes is of one degree with means four minutes, why do we write the indian standard meridian as 82°30' instead of 89°2'??
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Because 15 degrees of longitude is equivalent to 1 hour in time (that is 360 / 24) it is convenient to adopt time zones at 7.5 degrees or 15 degrees multiples.
In other words time zones are separated by multiples of 1 hour or 1/2 hour.
Raipunit:
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