Earth Day is celebrated annually on April 22. It is a global event dedicated to demonstrating support for environmental protection and raising awareness about environmental issues
. The first Earth Day was held on April 22, 1970, initiated by U.S. Senator Gaylord Nelson to engage the public in environmental activism
. Since then, it has grown into a worldwide event involving over a billion people in nearly 200 countries
. There is also an equinoctial Earth Day celebrated around March 20, which marks the astronomical spring equinox in the Northern Hemisphere and autumn equinox in the Southern Hemisphere. This version was proposed by John McConnell and focuses on peace and harmony with the planet, but the widely recognized Earth Day remains April 22
. In summary, Earth Day falls on April 22 each year. The "Earth Day 20" you mentioned likely refers to the year 2020 or the 20th day, but the official Earth Day date is April 22 annually
