Mattison, Hiram, 1811-1868 · New York, Huntington and Savage, Mason and Law · leaf 25
* Des-ig-xa-ted. 2* 18 PEIMAEY ASTEONOMY. 51. What are the Meridians of a Sphere ? They are lines drawn from pole topole upon its surface. [Meridians all meet at the Poles, and are most distant atthe Equator, as shown in the cut. Hence the length of adegree of longitude depends entirely upon the… … LESSON IY. OF LINES AND ANGLES.* 52. What is a Point? It is that which has no magnitude or extension, butsimply position. [ The common notion of a point is derived from the extremity of some slenderbody, such as the extremity of a common sewing-needle. This being perceptibleto the senses, is a…
Astronomy
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