Question

why is the standard Meridian selected by a multiple of 7.5 degree? please tell me ​

Answer 1

Answer:

The time kept at any place is denoted with reference to time at prime meridian (GMT or UT). Longitude of prime meridian is 0. All meridian east of prime meridian is called east longitude and west is called west longitude. Earth is divided in 180 degree east and 180 degree west. Total 360 . Each standard day is 24 hours. Dividing 360 by 24 is 15. Hence the standard time at any place can be found by dividing the longitude by 15. + For east and - for west. Each country chooses a suitable longitude and get it's standard time as per above. To be more accurate, it is divided by 7.5 to give standard time in half an hour interval

Explanation:

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