Theory:

‘Earth grid’ or ‘Geographic grid’
  • The grid pattern formed by the imaginary lines of latitude and longitude on the surface of the earth is called as Earth grid.
  • The latitudinal and longitudinal extensions are required to locate a place exactly on earth.
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Time on Earth
The Earth takes one day to rotate on its axis.
■■ 1 day = 24 hours
■■ 1 hour = 60 minutes
■■ 24 hours = 24 x 60 = 1440 minutes
■■ The angle of the earth = 360 °
■■ 360 ° = 360 Longitudes
■■ 360 ° = 1440 minutes
■■ So 1 ° = 1440/360 = 4 minutes
■■ In 4 minutes = 1°rotation
■■ In 60 minutes = 60/4 = 15° rotation
■■ So, in an hour (60 minutes) the earth rotates 15°