The Description and Use of Both the Globes, the Armillary Sphere, and Orrery; Exemplified in a Large and Select Variety of Problems in Astronomy. Trigonometry, Chronology, C. the Second

 
9781235783043: The Description and Use of Both the Globes, the Armillary Sphere, and Orrery; Exemplified in a Large and Select Variety of Problems in Astronomy. Trigonometry, Chronology, C. the Second
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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1773* edition. Excerpt: ... Chap. VI,; Ufe of the Celestial Globe in the Solution of Problems relative to the various Phaenomena of the Planets. difpatched the Problems y ! relative to the Sun and Moon,?j u. we come now to thofe of the Hfc Planets. In the Solution of Planetary Problems, the fignal and important Ufe of the Celeftial Globe will be no lefs confpicuous than in the former, and muft be very entertaining and advantageous, as by this Means we are always enabled to find how many, and what Planets are above the Horizon; and, confequently, the proper Subjefts for our InfpeStion and Obfervation at any given Time of the Year. But, as the Motion of fome of the Planets are very quick, and even thofe of the floweft are very fenfible in the Space of 12 Months, therefore it becomes neceflfary, by previous Calcula Calculation, to have their Places afcertained for every Day in the Year, (in the fame Manner as for the Moon) in an-Epbemeris; and hence it is we find jive feveral Columns following that of the Moon's Latirude in the Table of Geocentric Motions, appropriated to the jive Planets reflectively, mewing the Sign, Degree, and Minute of the Ecliptic which each Pianet pofTefTes on the Nuon of every Day throughout the Year. This is evident by Infpeftion of the Epbemeris for May,-which we gave in the foregoing Chapter, and is to be now coniulted for the Planets. The Inclinations of the Planetary Orbits, or the Angle they make with the Ecliptic, is, in general, fo fmall as, not to be regarded, except only for Mercury, and therefore the filk String, which was ufed for the Moon's Orbit, is not here neceflary. The Problems, therefore, peculiar to,the Planets, are but very few, and their Solutions are a,s follow; Prob. XXXVI. To find the Pl Ac E of thegiven...

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