The meridian chosen for Indian standard time is _____.
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → 82.5 degree East
Indian Standard Time is the local time of the 82.5° East meridian (82°30′ E), which passes near Mirzapur in Uttar Pradesh. It was chosen because it runs through the middle of India’s east–west extent. Each degree of longitude makes a difference of 4 minutes, so IST is 5 hours 30 minutes ahead of GMT (\(82.5\times4=330\) minutes).