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Earth grid or Geographic grid
• A grid-like pattern formed by the imaginary lines of latitude and longitude on the earth's surface, known as the Earth grid or Geographic grid.
• The latitudinal and longitudinal extensions are required to locate precisely any place on earth.
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 $$15°$$