Howe, Herbert A. (Herbert Alonzo), 1858-1926 · Meadville, Penna., Flood and Vincent · leaf 239
elooked for in the west. Since Mercury and Venus shine by reflecting the sun-light, and have no intrinsic radiance, they exhibit phasessimilar to those of the moon. At inferior conjunctionthe dark side of the planet is toward us ; as the planetmoves out toward western elongation its phase is a… … Fig. [07.—Conjunction and Elon-gation. Mercury and Venus. 233 which is a complete circle. Afterward it descendsthrough the gibbous phase, to a semicircle, and thenceto a narrow crescent again, as it approaches inferiorconjunction. Of Mercury little is known, for it is coy and keeps Mercurclose to…
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-400-277.webp)
