Earth's Rotation Day
Earth's Rotation Day is held on January 8. In 1851, the French physicist Léon Foucault demonstrated how the earth rotates by suspending a lead-filled brass ball from the top of the Panthéon in Paris. This event in the first decade of the month January is annual. 
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Similar holidays and events
Distaff Day on January 7 (medieval Europe);
I'm Not Going To Take It Anymore Day on January 7
Old Rock Day on January 7 (This day is completely dedicated to collect different rocks);
Argyle Day on January 8 (The argyle pattern comes from the tartan of Clan Campbell, which originated in Argyll in western Scotland);
Bubble Bath Day on January 8 (Bubble Baths have been popular for as long as baths with surfactant-based soap have been a thing);
Joy Germ Day on January 8 (Back in 1981, Joan White of Syracuse, New York thought of the idea of holding joy germ Day);
Male Watchers Day on January 8
Poetry At Work Day on January 8 (finding the beauty in your job and putting it into some form of artful prose);
Show & Tell Day At Work Day on January 8
Static Electricity Day on January 9
Play God Day on January 9 (What we do know ,is that God is good. Therefore, we believe that Play God Day is a day to do something good and extra special);
Coming of Age Day or Seijin Shiki or 成人式 in Japan on January 9 (celebrated on the second Monday of January)
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