Question

Why is the IDL not a straight line like the 180°meridian?​

Answer 1

Answer:

The Earth takes 24 hours to rotate through 360 degree (longitude). Hence, two places that are 15 degree of longitude apart have a difference of one hour. As the Sun rises in the east and sets in the west. This adds up to a difference of 24 hours or one day between east and west of 180 degree line of longitude.

Explanation: