One [method] is by a Watch to keep time exactly. But, by reason of the motion of the Ship, the Variation of Heat and Cold, Wet and Dry, and the Difference of Gravity in different Latitudes, such a watch hath not yet been made.

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Quote text and notes from Wikiquote: Isaac Newton (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.