What divides the Earth into eastern and western hemispheres?
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Prime Meridian divides the earth into eastern and western hemispheres.
The meridian, which passed through Greenwich, where the British Royal Observatory is located. This meridian is considered as the Prime Meridian.
Its value is 0° longitude and from it, we count 180° eastward as well as 180° westward. The Prime Meridian and 180° meridian divide the earth into two halves, the Eastern Hemisphere and the Western Hemisphere