Mattison, Hiram, 1811-1868 · New York, Huntington and Savage, Mason and Law · leaf 29
22 PRIMARY ASTRONOMY. The 60tli part of a minute, or the 756,000th part of acircle. [1. Thus all circles, whether great or small, are supposed to be divided into 360equal parts called degrees, and marked thus, 360°. Each degree is again subdividedinto 60 equal parts, called minutes, and each minute…
Astronomy
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