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5. Why is the standard Mendian selected by a country a multiple of 7.5?​

Answer»

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

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