Page 2 - Lesson Notes
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meridian of a country as the standard time for the country for uniformity.
In India, the longitude of 82° E (82° 30' E) is treated as the standard
meridian and the local time at this meridian is considered as the
standard time for the whole country. It is known as the Indian Standard
Time (IST).
Similarly some countries have adopted more than one standard time
due to their great longitudinal extent. For example, in Russia, there are
as many as eleven standard times.
The earth has been divided into twenty-four time zones of one hour
each. Each zone thus covers 15° of longitude.