No. Einstein excelled at mathematics. The myth likely grew from a failed entrance exam in other subjects and a reversed grading scale at his Swiss school.
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Newton did say an apple fall prompted his thinking about gravity, but no source says it hit his head, and the idea developed gradually rather than in one moment.
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Sailors compared local time with the time at a fixed point such as Greenwich. They got Greenwich time from a marine chronometer or from the Moon's position, a method called lunar distances.
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