A high-school astronomy: in which the descriptive, physical, and practical are combined .. (1853)
Mattison, Hiram, 1811-1868 · New York, F. J. Huntingdon [etc.] · leaf 23
of a sphereare the extremities of itsaxis, or the points wherethe axis cuts the two op-posite surfaces. The Equator of a sphere is an imaginary circle uponits surface, midway between its poles, the plane of whichcuts the axis perpendicularly, and divides the sphereinto two equal parts or… … MERIDIAN. The equator of a sphere is sometimescalled a Great Circle, because no largercircle can be drawn upon its surface. A Less Circle is one that divides asphere into two unequal parts. In the cut, the circles are represented in perspective. TheGreat Circle embraces the middle of the sphere,…
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)
