An introduction to astronomy : designed as a text book for the students of Yale College (1846)
Olmsted, Denison, 1791-1859, Yale College (1718-1887) · New York : Collins, Brother & Co. · leaf 33
to be 104 miles. Then,since there are 360 degrees of latitude in the entire circumference, 249fi0 1° 30: 104:: 360° : 24960. And =7944. 3.1416 The foregoing approximations are sufficient to show that the earth is about 8,000 miles in diameter. 15. The greatest difficulty in the way of acquiring… … DOCTRINE OF THE SPHERE. 9 of space, and encircled on all sides with the starry sphere. Heshould free his mind from its habitual proneness to consider onepart of space as naturally up and another down, and view him-self as subject to a force which binds him to the earth as truly asthough he were…
Astronomy
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