Wilkins, John H. (John Hubbard), 1794-1861, Duke University. Library. Jantz Collection. German Americana · Boston : Hilliard, Gray and Co. · leaf 103
y.They may therefore be omitted by those who are ignorantof that branch of mathematics, 148. The distance of the moon was long since ascer-tained with the utmost accuracy by means of her paral-lax. There are several methods of obtaining this paral-laX; ami of applying it. The following is one of… … of latitude, be previouslyknown. When the moonM passes the meridian ofthese observers, let each,with a good instrument, takeher zenith distance; that is,the arc ZM and zM. Inthe triangle AOB, the sidesOA and OB are each equalto the semidiameter of theearth, which is known; andthe angle AOB is…
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-328-219.webp)
