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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 ... / by James Ferguson
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Platk XV.

>f. 'KJ-:?*

Ftg* 4 .

• j\si/nt/s. U

*

V'

sri

'^' r/V

,2^;

/

^•4v.

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