Wentworth, G. A. (George Albert), 1835-1906 · Boston, Ginn & company · leaf 37
turning about the centre 0. Thisangle will be measured by thearc described by the point P;and it may have any magnitude,because the arc described by Pmay have any magnitude. Let the horizontal line OA bethe initial position of OP, andlet OP revolve in the directionshown by the arrow, or oppositeto… … GONIOMETRY. „ 29 During one revolution OP will form with OA all angles from0° to 360°. Any particular angle is said to be an angle of thequadrant in which OP lies; so that, Angles between 0° and 90° are angles of Quadrant I. Angles between 90° and 180° are angles of Quadrant II. Angles between 180°…
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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-162-91.webp)
