Elements of astronomy ... with explanatory notes, and questions for examination (1855)
Brocklesby, John, 1811-1889 · New York, Farmer, Brace & co. · leaf 35
rth rotates, like a wheel or an axle. Its extremities are thepoles of the earth. A diameter drawn at right angles, to the polar diame-ter, and passing through the centre of the earth is an equatorial diameter.(See Fig. 12.) Is the enrtli exactly spherical 1 How much shorter than the equatorial… … A SECTION OF THE EARTH. trigonometry1 both the height of the mountain AB, andthe length of the line AD, and geometry then informs usthat there are such relations existing between the linesAD, AC, and AB, as can be expressed by the followingproportion; viz., AB : AD: : AD: AC. The length ofthe line…
Astronomy
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