Smith, Hamilton Lanphere, 1819-1903. [from old catalog] · Cleveland, M. C. Younglove and company · leaf 24
ctly arbitrary. The circle might have been divided into just100, or 1000 parts, and these called degrees, but it was convenientto adopt for the length of a degree, a space which would representthe progress of the sun in one day as nearly as was possible.When we speak of a degree, it must be… … a common centre, and two lines drawn from that centre, including20 degrees of each circle. All circles are supposed therefore, to be divided into 360 parts,and the 1-360 part of any circle is called a degree. Two kinds of circles are supposed to be traced on the earth, as also in theheavens, viz,…
Astronomy · Meteorology · Geology · Paleontology
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