Earth Day.

Earth Day is celebrated worldwide on April 22 annually to raise public awareness about the environment and inspire people to save and protect it. The theme for this year's Earth Day is "Restore Our Earth" which focuses on natural processes and emerging green technologies that can restore the world's ecosystems.
 
Earth Day is recognised as the largest civic event in the world. ... Earth Day is celebrated on April 22 every year. The day aims to raise awareness among masses about climate change and global warming. The day inspires to act towards the protection of the environment and focus on the need for conservation.
 
Earth Day Facts for Kids
  • Senator Gaylord Nelson conceived Earth Day in the early 1960s. ...
  • The first Earth Day was in 1970. ...
  • The government responded to Earth Day with environmental legislation. ...
  • Earth Day went global in 1990. ...
  • About one billion people recognize Earth Day each year. ...
  • Earth Day always falls on April 22.
 
Way to measure a day is to count the amount of time it takes for a planet to completely spin around and make one full rotation. This is called a sidereal day. On Earth, a sidereal day is almost exactly 23 hours and 56 minutes.
 
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