Elements of astronomy ... with explanatory notes, and questions for examination (1855)
Brocklesby, John, 1811-1889 · New York, Farmer, Brace & co. · leaf 29
stances from the pins to the pencil; viz.,F*M, FM, &c, is invariable. 18. Eccentricity. Ellipses differ among themselves.If the foci are near the centre of the ellipse, the ellipseapproaches the form of a circle; but if the foci departwidely from it the length of the conjugate axis is smallin… … Figs. 9 and 10, two ellipses are exhibited which differgreatly in their eccentricity ; one being almost a circle,and the other very oval. 1. Eccentric, from ex out of\ and centrum centre, (Latin) out of thecentre. Construct nn ellipse 1 What is meant by the term eccentricity 1 22 ASTRONOMY. 19. A…
Astronomy
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