Peck, William G. (William Guy), 1820-1892 · New York, Chicago, A. S. Barnes & company · leaf 97
c, the ellipse becomes a circle ; if theaxis lies in the plane of the ecliptic, the ellipse becomes astraight line. The angle at the earth subtended by the semi-transverse 92 XSTROtfOMy. axis of the ellipse, which is equal to the angle at the starsubtended by that semi-diameter of the earths… … Explanation. S represents the sun ; E the earth in its or-S bit; and S the star. SS is the axis of the parallactic cone ; SEis the radius-vector of the earths orbit which is perpendicularto SS: and ESS is the stellar parallax, denoted by p. In the right-angled triangle SSE we have, sinceESS is a…
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-201-122.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-103-240.webp)
