Ball, R[obert] S[tawell], Sir, 1840- [from old catalog] · New York, H. Holt and company · leaf 104
of Venus, to which wehave already referred. We shall endeavour to sim-plify the statement of this methodby leaving out several of the de-tails which complicate its application in practice. The planet Venus on certain rare occasions comesbetween the earth and the sun, and is then seen byan observer… … 86 Astronomy. and then moving across the sun in a direction whichis indicated by the dotted line a b, leaves the sun at b.The time occupied in the passage of Venus acrossthe sun may be about four hours. When Venus isjust completely inside the sun, as shown in the figure,where the circle expressing…
Astronomy
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![An illustration from Nicolai Copernici Torinensis De reuolutionibus orbium coelestium, libri VI : Habes in hoc opere iam recens nato, & aedito, studiose lector, motus stellarum, tam fixarum, quàm erraticarum, cum ex ueteribus, tum etiam ex recentibus obseruationibus restitutos: & nouis insuper ac admirabilibus hypothesibus ornatos. Habes etiam tabulas expeditissimas, ex quibus eosdem ad quoduis tempus quàm facillime caculare poteris. Igitur eme, lege, fruere. [Line in Greek] (1543)](https://img.insideoutlibrary.com/img/200/ia-nicolaicopernici00cope-217-133.webp)
