Brocklesby, John, 1811-1889. [from old catalog] · New York, Sheldon and company · leaf 39
th rotates, like a wheel on 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 earth exactly spherical 1 How much shorter than the equatorial… … A SECTION OF THE EARTH. trigonometryl 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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