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One Earth day is equal to 23 hours, 56 minutes and 4.1 seconds (the time required to complete a single rotation of the Earth).
Earth Day is an annual event, celebrated on April 22, on which day events worldwide are held to demonstrate support for environmental protection. It was first celebrated in 1970, and is now coordinated globally by the Earth Day Network and celebrated in more than 193 countries each year. On Earth Day 2016, the landmark Paris Agreement is scheduled to be signed by the United States, China, and some 120 other countries.