Question

Calculate the time at place A, located at 90° W longitude, if it is 1PM at place B located at 15° W longitude ? ​

Answer 1

Answer:

Earth takes 24hours to rotate by 360°. It implies that it takes 4min to rotate by 1° i.e., in 1hour it rotates by 15°.

We take the time at Prime meridian (0°longitude) as standard reference and calculate local time for any given longitude.

Now, since Earth rotates from West to East, Eastern hemisphere will be ahead in time than the Western Hemisphere. So, time gets added to the East longitudes and gets subtracted for West longitudes from Greenwich mean time.

Given that @ 0°, it is 1PM. Thus for 90°E longitude, add (90*4) minutes =360minutes =6hours to 1PM. So, the time @90°E longitude is 7PM.

Explanation:

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