Question

What is the relationship between longitude and time? Give examples.

Answer 1

The Earth rotates 360° of longitude in 24 hours, which means that for 1-degree rotation of longitude, the Earth takes 4 minutes. As the Earth rotates, every meridian on it faces the Sun at least once. As the Earth rotates from west to east, the places situated to the east of the Prime Meridian have sunrise earlier than those situated to its west.
The time difference between any two places is due to the difference in longitudes between those places. For example, Kolkata is located at 90°E longitude and London at 0°. The time difference is thus 6 hours between the two.