Mattison, Hiram, 1811-1868 · New York, Huntington and Savage, Mason and Law · leaf 28
] 74. How is the Circumference of a Circle divided ?Into Signs, Degrees, Minutes, and Seconds. [The student will probably recognize these divisions as what he has previouslylearned among his Arithmetical Tables, under the head of Circular Measure.] 75. What is a Sign ? The twelfth part of a circle.…
Astronomy
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