Identifier: guyselementsofa00guyj (find matches)
Title: Guy's Elements of astronomy : and an abridgment of Keith's New treastise on the use of the globes
Year: 1864 (1860s)
Authors: Guy, Joseph, 1784-1867 Keith, Thomas, 1759-1824. A new treatise on the use of the globes
Subjects: Astronomy
Publisher: Philadelphia, C. Desilver
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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. . 7 73 nil CONTENTS. The PhasRs of the Moon 74 CHAPTER XXVm. Echpses. . . . 75 Eclipse of the Moon • . 76 Eclipse of the Sua . . 77 CHAI*TER XXIX. Polar Day and INigUt, &c. 79 CHAPTER XXX.Umbra and Penumbra inEclipses .... 81 CHAPTER XXXI. Tlie Transit oi Venus . 84 Occultation of the fixed Stars 86 CHAPTER XXXn.The Harvest Moon . . 87 CHAPTER XXXm.The Harvest Mcx^n, continued 90 CHAPTER XXXIV.Of Leap-year ... 92 CHAPTER XXXV. The Tides ... 95 CHAPITER XXXVI. The Tides, continued . . 98 CHAPTER XXXVII.The Tides, continued . .100 CHAPTER XXXVni.The Precession of the Etiuincx 104 CHAPTER XXXIX The Precession of the Equi-nox, continued . . . 107 CHAPTER XL.The Obliquity of the Ecliptic,&c 109 CHAPTER XLL To find the ProportionateP^agnitudes of the Planets To find the Planets Distancesfrom the Sun Questions for Exan ination 111ib113 EXPLANATION OF SIGNS. O The Sun. The Mf>on.The Earth.Mercury.Venus.Mars Jl Jupiter. b Saturn >t^ Uranu* ? Ceres. <^ Palla# ? Juno. a Vesu
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ELEMENTS OF ASTRONOMY. CHAPTER I. PRELIMINARY DEFINITIONS. AsTKONOMY is that branch of natural philosophywhich treats of the heavenly bodies: it consists of twoparts, namely, descriptive and physical AstYonomy, Descriptive Astronomy^ comprises an account of tnephenomena of the heavenly bodies. Physical Astronomy consists in the investigation ofthe causes of their motions, ^o,. A Circle is a plain figure, bounded by a uniform curve line, called the ciicumference, which is every where equulistant from a certain point within, called its centre, as A B C D (pi. 1. ?ig. 1.) The (.ir^umference itself is often called a circle, and also the periphery. The Radius of a circle is a line drawii froia the centre to the circumference; as A E, E B, or E C (fig-1-) The Diameter of a circle is a line drawn throii^Qfh thecentre, and terminated at both ends by the circum-ference, as A E C (fig. 1.) Every Diameter is double the radi!is,and divides the circle into t^voequal parts. The terminating points o

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