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Astronomy explained upon Sir Isaac Newton's principles, and made easy to those who have not studied mathematics. : To which are added, A plain method of finding the distances of all the planets from the sun, by the transit of Venus over the sun's disc, in the year 1761. : An account of Mr. Horrox's observation of the transit of Venus in the year 1639: and, of the distances of all the planets from the sun, as deduced from observations of the transit in the year 1761

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