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 128
ns attraction retards the planet, jj,just as gravity retards a ball rolled uphill; and when it has reached C, itsvelocity is very small, and the attrac-tion at the center of force causes aa great deflection from the tangent,sufficient to give its orbit a great cur-vature, and the planet turns… … 187. We may imitate the motion of a body in its orbit by sus-pending a small ball from the ceihng by a long string. The ballbeing drawn out of its place of rest, (which is directly under thepoint of suspension,) it will tend constantly towards the sameplace by a force which corresponds to the force…
Astronomy
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