Earth Day is celebrated in most countries around the world on the vernal equinox, the beginning of spring in the Northern Hemisphere and the beginning of fall in the Southern Hemisphere. On this date, night and day are equal everywhere on the planet.
In the U.S. we celebrate Earth Day on April 22nd. The first American Earth Day was in 1970, an event founded by Senator Gaylord Nelson of Wisconsin. In 1995 he received the Presidential Medal of Freedom in recognition of his environmental work.
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