Howe, Herbert A. (Herbert Alonzo), 1858-1926 · Meadville, Penna., Flood and Vincent · leaf 160
ard the line is traced on the sky till it reachesthe zenith. As we go on, the circle which we havebeen tracing runs down from the zenith to the northpoint of the horizon. The telescope is now horizontal,and pointing northward. We continue revolving thetelescope in the same direction ; the eyepiece… … The telescopeis revolved. 154 A Study of the Sky. Mechanical perfection sought. Perfectionimpossible. ian of the place of observation. When the telescopefinally reaches its original horizontal southward-pointingposition, the sight-line has traced the celestial meridianon the sky, and the…
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-304-198.webp)