Picture By NASA
Earth Day is a day designed to inspire awareness and appreciation for the Earth’s environment. It was founded by U.S. Senator Gaylord Nelson as an environmental teach-in held on April 22, 1970. Earth Day is celebrated in spring in the Northern Hemisphere and autumn in the Southern Hemisphere. Many communities celebrate Earth Week, an entire week of activities focused on environmental issues. The first Earth Week originated in Philadelphia in 1970 (starting April 16 and culminating on Earth Day, April 22.) Earth Day Network, a group that wishes to become the coordinator of Earth Day globally, asserts that Earth Day is now observed on April 22 on virtually every country on Earth. World Environment Day, celebrated on June 5 in a different nation every year, is the principal United Nations environmental observance.
Well, yes and no. While April 22 is the date commonly celebrated as Earth Day in the United States, there is another Earth Day that occurs about a month earlier and is celebrated in many countries around the world. International Earth Day coincides with the vernal equinox, which is the first day of spring in the northern hemisphere and the first day of autumn south of the equator. This year, the vernal equinox is March 20, which means today is also International Earth Day.
No matter which Earth Day you choose to observe, its meaning and value are the same. Earth Day is a time when millions of people celebrate and renew their personal commitment to environmental stewardship, join together to raise public awareness about the need for increased conservation, and pledge to take better care of the planet we all call home.
Source: Wikipedia, About Environment