A new manual of the elements of astronomy, descriptive and mathematical .. (1868)
Kiddle, Henry, 1824-1891 · New York, Ivison, Phinney, Blakeman & co.; Chicago, S.C. Griggs & co. · leaf 95
Questions.—How is this fact shown? What is the third proof? Illustrate it.Explain by the diagram, b. How is the size of the earth found ? Explain by thediagram. 90 THE EARTH. / / / … simple proportion, the circumference of the earth. For, suppose theangular distance is founcf to be Zj°, and the actual distance 172.76miles; then 2^° : 360° :: 172.76 miles : 24,877 miles. This must be thecircumference of the earth; and dividing 24,877 miles by 3.1416, theratio of the…
Astronomy
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