Unofficial Earth Day flag, including a NASA photo.

Earth Day 2007 at San Diego City College in San Diego, California.

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Earth Day is a name used for two different observances, both held annually during spring in the northern hemisphere, and autumn in the southern hemisphere. These are intended to inspire awareness of and appreciation for the Earth's environment. more...

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The United Nations celebrates Earth Day each year on the March equinox, while a global observance in many countries is held each year on April 22.

The Equinoctial Earth Day

The equinoctial Earth Day is celebrated on the March equinox (around 20 March) to mark the precise moment of mid-spring in the Northern Hemisphere, and of mid-autumn in the Southern Hemisphere. An equinox in astronomy is that moment in time (not a whole day) when the center of the Sun can be observed to be directly above the Earth's equator, occurring around March 20 and September 23 each year. Although astronomically they occur at the mid-point of the seasons, in some cultures the equinoxes and solstices are considered to start or separate the seasons.

John McConnell first introduced the idea of a global holiday called "Earth Day" at a UNESCO Conference on the Environment in 1969. The first Earth Day proclamation was issued by San Francisco Mayor Joseph Alioto on March 21, 1970. UN Secretary-General U Thant supported McConnell's global initiative to celebrate this annual event, and on February 26, 1971, he signed a proclamation to that effect, saying:

May there only be peaceful and cheerful Earth Days to come for our beautiful Spaceship Earth as it continues to spin and circle in frigid space with its warm and fragile cargo of animate life.

Secretary General Waldheim observed Earth Day with similar ceremonies in 1972, and the United Nations Earth Day ceremony has continued each year since on the day of the March equinox. At the moment of the equinox, it is traditional to observe the day by ringing the Japanese Peace Bell, a bell donated by Japan to the United Nations. The United Nations also works with organizers of the April 22nd global event.

The April 22 Earth Day

Growing Eco-activism before Earth Day 1970

The 1960s had been a very dynamic period for ecology in the US, in both theory and practice. It was in the mid-1960s that Congress passed the sweeping Wilderness Act, and Supreme Court Justice William O. Douglas asked, "Who speaks for the trees?" Pre-1960 grassroots activism against DDT in Nassau County, NY, had inspired Rachel Carson to write her shocking bestseller Silent Spring (1962).

Earth Day 1970

Responding to widespread environmental degradation, Gaylord Nelson, a United States Senator from Wisconsin, called for an environmental teach-in, or Earth Day, to be held on April 22, 1970. Over 20 million people participated that year, and Earth Day is now observed each year on April 22 by more than 500 million people and national governments in 175 countries. Senator Nelson, an environmental activist, took a leading role in organizing the celebration, hoping to demonstrate popular political support for an environmental agenda. He modeled it on the highly effective Vietnam War protests of the time. The concept of Earth Day was first proposed in a memo to JFK written by Fred Dutton.