Which of the following longitude is considered as the reference for Indian Standard Time?

Correct option is A

The correct answer is (A) 82° 30' Eastern

Explanation:
• Indian Standard Time (IST) is based on the 82° 30' Eastern longitude.
• This longitude is considered the reference for IST, which is 5 hours and 30 minutes ahead of Coordinated Universal Time (UTC).
• The time is calculated from this specific meridian as it passes through Mirzapur, a town in Uttar Pradesh, India.

Information Booster:
• The Indian Standard Time is uniform throughout India, despite the country spanning across several longitudes.
• The choice of 82° 30' was made to ensure that the entire country has a standard time, simplifying coordination for administrative and other purposes.