The line that divides the earth into the Northern and Southern Hemispheres is called the equator.
The line that divides the earth into the Western and Eastern Hemispheres is called the Prime Meridian, running through Greenwich, England.
While there aren't any actual lines painted on the earth, the town of Greenwich has a special feature. Someone painted a line at the location of the Prime Meridian. See! These kids are standing in the Eastern and Western Hemispheres at the same time!
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