Question

From which of the following longitude the indian standard time is determined?
A. 82.5°E
B. 80° west
C. 90° east
D. 82.30'E

Answer 1

Hint: India is situated north of the equator between 8°4' north to 37°6' north latitude and 68°7' east to 97°25' east longitude. The Indian Standard time is the time zone that is observed throughout India. It crosses the city of Mirzapur in Uttar Pradesh.

Complete Step by Step answer: The Indian Standard Time is determined from 82.5°E longitude.The distance between India’s east and west is 2,933 km. This results in the rising and setting of the sun two hours earlier in Arunachal Pradesh in the east than the Rann of Kutch in the west. The Indian Standard time was established in 1947.India does not use the method of Daylight Saving Technique. The standard time is calculated on the basis of 82.5°E longitude from an observatory in Mirzapur, Allahabad as it is near to the reference line.
Although Kolkata and Mumbai did observe their own local time till 1948 and 1955.The central observatory was shifted from Chennai to Uttar Pradesh. During the Indo China war and Indo Pakistan was the Daylight Saving Time was briefly used. The offset of the Indian Standard Time is UTC+5:30. This shows that India is five hours thirty minutes ahead of Greenwich Mean Time.

Note: Greenwich Mean Time is measured by the zero degree line of the Earth’s meridian. The line crosses the North pole to South Pole and passes through the Old Royal observatory in London. All the time zones in the world are calculated through this. While answering this question do not get confused between the IST and GMT.