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 226
he whole revolution occupies30 years, and the edge is presented to the sun twice in the revolu-tion, this last phenomenon, namely, the disappearance of the ring,takes place every 15 years. 342. The learner may perhaps gain a clearer idea of the fore-going appearances from the following diagram: Let… … lar to the line CG, it would be seen by a spectator situated at aor 6 a perfect circle, but being inclined to the line of vision 28° 4, * It may be remarked by the learner, that these orbits are made so elliptical, not iarepresent the eccentricity of either the earths or Saturns orbit, but merely…
Astronomy
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