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Identifier: elementsofastro00youn Title: The elements of astronomy; a textbook Year: 1919 (1910s) Authors: Young, Charles A. (Charles Augustus), 1834-1908 Young, Anne Sewell, b. 1871., ed Subjects: Astronomy Constellations Publisher: Boston, New York [etc.] Ginn and Company Contributing Library: The Library of Congress Digitizing Sponsor: The Library of Congress View Book Page: Book Viewer About This Book: Catalog Entry View All Images: All Images From Book Click here to view book online to see this illustration in context in a browseable online version of this book. Text Appearing Before Image: ect of the Combination of the Earths Motion withthat of a Planet. — The apparent or geocentric motion of aplanet is therefore made up of two motions, and appears to bethat of a body moving once a year around the circumferenceof a circle equal to the earths orbit, while the centre ofthis circle itself goes around the sun upon the real orbitof the planet, and with a periodic time equal to that of theplanet. 204 EXPLANATION OF TERMS. [§288 Jupiter, for instance, appears to move as in Fig. 74, making 11loops in each revolution, the smaller circle having a diameter of about one-fifth of the larger one, uponwhich its centre moves, sincethe diameter of Jupiters orbitis about five times that of theearth. As a consequence, wehave an apparent back-and-forth movement of theplanets among the stars.They move eastward (tech-nically advance ) part ofthe time, and part of thetime they move westward(technically retrograde ),the arc of retrogression be-ing, however, always less than that of advance. Text Appearing After Image: Fig. 74.Apparent Geocentric Motion of Jupiter. 289. Explanation of Terms.—Fig. 75 illustrates the mean-ing of a number of terms which are used in describing aplanets position with reference to the sun, viz., Opposition,Quadrature, Inferior and Superior Conjunction, and GreatestElongation. E is the position of the earth, the inner circlebeing the orbit of an inferior planet, while the outer circleis the orbit of a superior planet. In general, the anglePES (the angle at the earth between lines drawn from theearth to the planet and the sun) is the planets elongation.For a superior planet, it can have any value from zero to 180°;for an inferior, it has a maximum value that the planet can-not exceed, depending upon the diameter of its orbit. 290. Motion of a Planet in Eight Ascension and Longitude. — Starting from the line of superior conjunction, the planet whethersuperior or inferior, moves eastward or direct for a time, but at a §290] MOTION OF THE PLANETS. 205 rate continually sl Note About Images Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.