Ball, R[obert] S[tawell], Sir, 1840- [from old catalog] · New York, H. Holt and company · leaf 36
17 that the figure of the earth is such as would be pro-duced by the revolution of the curve called an ellipseabout its minor axis. In the case of the earth, thelength of the axis a b (fig.6) of the ellipse is 12,712kilometres, while the axiscd is 12,757 kilometres.It will thus be seen thatthe… … CHAPTER IV. THE ROTATION OF THE EARTH ON ITS AXIS. § 14. Rotation of the Earth.—We now revert tothe subject of the apparent diurnal motion of theheavens round the earth. This motion may be ex-plained either by the supposition that there is realmotion of all the stars, with the sun, moon,…
Astronomy
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