Olmsted, Denison, 1791-1859. [from old catalog] · New York, R. B. Collins · leaf 51
nter of the earth. Thus, if the angleAEC (Fig 7,) be found, the radius of the earth AC be-ing known, we have in the right angled triangle AEC,the side AC and all the angles, to find the side CE,which is the distance of the moon from the center ofthe earth.* REFRACTION. 68. While parallax depresses… … 67. Why is the determination of the parallax of a heavenlybody an element of great importance ? Illustrate by figure 7. * Should the reader be unacquainted with the principles of trigonom-etry, yet he ought to know the fact that these principles enable us,when we have ascertained certain parts in a…
Astronomy
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