Lessons in astronomy including uranography. A brief intoductory course without mathematics (1896)
Young, Charles A. (Charles Augustus), 1834-1908 · Boston, London, Ginn and company · leaf 92
llipse, with the sunat one of its foci (as illustrated in Fig. 12), but is much more 119] DEFINITION OF TERMS. 81 nearly circular than the oval there represented. Its eccen-tricity is only about -^; that is to say, the distance from thecentre of the sun to the mid-dle of the ellipse is only… … Fig. 12. — The Ellipse. 120. Definition of Terms.—The points where the earth isnearest to and most remote from the sun are called respec-tively the Perihelion and the Aphelion (Dec. 31st and June30th), the line joining them being the Major-axis of the orbit.This line, indefinitely produced in both…
Astronomy
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