PREVIOUSLY ASKED IN:
WBPSC Miscellaneous Preliminary 2023
Answer
\\( 82.5^\\circ \\) East
Explanation
Indian Standard Time (IST) is calculated on the basis of the \\( 82.5^\\circ \\) East (or \\( 82^\\circ 30' \\) E) longitude. This standard meridian passes through Mirzapur, near Allahabad in Uttar Pradesh. The IST is exactly 5 hours and 30 minutes ahead of Greenwich Mean Time (GMT +5:30).
Key Points
- > Standard Meridian: \\( 82.5^\\circ \\) East or \\( 82^\\circ 30' \\) East.
- > Passes through Mirzapur (Uttar Pradesh).
- > It passes through 5 Indian states: UP, MP, Chhattisgarh, Odisha, Andhra Pradesh.
- > IST is 5.5 hours ahead of GMT.
- > 1 degree of longitude equals 4 minutes of time difference.
- > \\( 82.5 \\times 4 = 330 \\) minutes = 5 hours 30 mins.
- > There is a nearly 2-hour time lag between Gujarat and Arunachal Pradesh.
Additional Information
Important Latitudes & Longitudes
| Line | Value | Significance in India |
|---|---|---|
| Tropic of Cancer | \\( 23.5^\\circ \\) N | Passes through 8 states |
| Standard Meridian | \\( 82.5^\\circ \\) E | Passes through 5 states |
| Greenwich Meridian | \\( 0^\\circ \\) | Base for world time (GMT) |
Memory Tips
- 82.5 East: Remember that India is to the East of Greenwich, so time is added. Multiply 82.5 by 4 minutes to get 330 minutes (5.5 hours).