Answer» - The biggest clock of the earth is the sun.
- The time of a place is decided by the location of the sun in the sky.
- However, to be precise, the time of the places on the earth is decided through longitudes.
- There are total 360 longitudes on the earth.
- The earth takes 24 hours to complete one rotation.
- Thus, in one hour, 15 longitudes (360/24 = 15) pass through the sun.
- In other way, it takes 4 minutes (60/15 = 4) for the earth to pass one longitude through the sun.
- This makes it clear that there is difference of 4 minutes between two adjacent longitudes.
- This time difference is used to decide the time of a particular place.
- According to this, the time at different longitudes is different at different places on the earth.
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