Elements of theoretical and descriptive astronomy, for the use of colleges and academies (1901)
White, Charles J · New York: J. Wiley & sons · leaf 28
t it is better to consider them as independent propositions. 12. The Astronomical Triangle.—The spherical triangle PZA(Fig. 3) is called the astronomical triangle. It is formed by thearcs of the meridian of the place, and of the vertical circle andthe hour circle passing through some heavenly body,… … 24 DIURNAL CIRCLES. place; PA, the polar distance of the body; and ZA, its zenithdistance. The three angles are: ZPA, the hour angle of thebody; PZA, its azimuth; and PAZ, an angle which is rarelyused, and which is commonly called the position angle of thebody. The co-latitude and the zenith…
Astronomy
Internet Archive · Public Domain Mark 1.0. Free to use for anything.
![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-359-250.webp)
