The standard meridian of Iraq is 48° E and the standard meridian of India is 82.5° E. What is the time difference between India and Iraq?
Answers
The time difference between India and Iraq is 2 hours and 36 minutes.
India is 2 hours 36 minutes ahead of Iraq, eg: 7.36 pm in india
5.00 pm in Iraq
Explanation: distance between the meridian of India and Iraq is (82.5°E - 48°E) = 34°5E
Therefore, the time distance is (34°5E*4) = 156 minutes or 2 hours 36 minutes.
The key to answer is the relationship between the longitude (meridian) and time. Time changes along with the longitude on earth. The earth takes 24 hours to rotate on its own axis and also covers the angular distance of 360°. Now, we can imagine the nearly round (ellipsoid) earth has four right angles 90° (at the intersection points of prime meridian and standard parallel), so the angle will be (4*90) = 460°.
Now earth covers this 360° angular distance in 24 hours or 1440 minutes (24*60 = 1440 minutes), therefore 1° angular distance or 1° distance between two meridians is covered by 4 minutes ( 1440/360 = 4 minutes).
And, 15' distance between two meridians is covered by 1 minutes ( 1°/4 = 15')