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Earth Day WAS STARTED IN THE 1960S
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the fourth decade. 1947
1990s.
April 22,1970
Earth day is celebrated on 22nd of April . And also equinox earth day is celebrated on march 20. People started celebrating earth day from 22nd april,1970.
days in a decade
There is no year 0 in the calendar we follow. 1 BC moves directly into 1AD. The first decade was AD 1-10. The second, AD 11-20. We will begin to celebrate the next decade on January 1, 2011.
Early 1970's
On the day god finished creatong the Earth.
On the 1st of January 2011.
A decade on Neptune is about 164 Earth years, as it takes Neptune about 165 Earth years to complete one orbit around the sun.
840s
1950