Elements of theoretical and descriptive astronomy, for the use of colleges and academies (1901)
White, Charles J · New York: J. Wiley & sons · leaf 142
alunar and a solar eclipse would occur in every month. Owing,however, to the inclination of the plane of the moons orbit tothe plane of the ecliptic, the latitude of the moon is usually toogreat to allow either kind of eclipse to take place; and it is onlyin special cases, when the moon is in or… … rig. 57 136 LUNAR ECLIPSE. the earth. Draw the lines BH and CO, tangent to the twospheres. These lines will meet at some point A, and AHEOwill be a section of the shadow cast by the earth. The whole shadow is of a conical shape, the vertex of the conebeing at A ; and a lunar eclipse will occur…
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-401-278.webp)
