The eighth of September, 9-8, is honored as Gravity Day by those who know that the gravitational constant on the surface of Earth is 9.8 m/sec2. I know of no connection for this day to the life of Isaac Newton, but I'm wearing my tie that shows some of his equations regarding gravity! Albert Einstein completely changed our understanding of how gravity works, but Newton's equations are still very useful, even guiding all of the calculations for aviation and lunar and interplanetary exploration.
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