Olmsted, Denison, 1791-1859. [from old catalog] · New York, R. B. Collins · leaf 212
o a line, and we either lose sightof it altogether, or by the aid of the most powerfultelescopes, we see it as a fine thread of light drawnacross the disk and projecting out from it on each side.As the whole revolution occupies 30 years, and the edgeis presented to the sun twice in the revolution,… … Let A, B, C, &c. represent successive positions ofSaturn and his ring in different parts of his orbit, whileabc represents the orbit of the earth.* Were the ringwhen at 0 and G perpendicular to the line of vision,it would be seen by a spectator situated at a or d aperfect circle, but being…
Astronomy
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