[Coffin, John Huntington Crane], 1815-1890. [from old catalog] · New York, D. Van Nostrand · leaf 227
r body, and the circle A A A will pass through the zeniths of all places on the terrestrial circle, andM A, M A, &c, will be equal zenith distances. The altitude of the body will also be the same at all placeson the terrestrial circle AAA; hence such a circle is calleda circle of equal… … Fig. 37. CIRCLES OF EQUAL ALTITUDES. 221 body; which, in the c&se of the sun, is the Greenwich appar-ent time, or 24h—that apparent time, according as the timeis less or greater than 12h. This is evident from the dia-gram, in which, regarded as on the celestial sphere,P M is the celestial…
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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-214-129.webp)
![An illustration from Divina proportione : opera a tutti glingegni perspicaci e curiosi necessaria oue ciascun studioso di philosophia: prospettiua pictura sculptura: architectura: musica: e altre mathematice: suavissima: sotile: e admirabile doctrina consequira: e delecterassi: co[n] varie questione de secretissima scientia (1509)](https://img.insideoutlibrary.com/img/200/ia-divinaproportion00paci-120-333.webp)
