Question

Why is the Standard Meridian selected by a country a multiple of 7.5°?​

Answer 1

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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Answer 2

Explanation:

1 degree=4minutes and 15 degree=1 hour. In general, time zones are selected in intervals of 1 or 1/2 hour. Hence 7.5°, which is equivalent to 1/2 hour is chosen as standard meridian.

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