Observations of the Changeable Brightness of the Satellites of Jupiter, and of the Variation in Their Apparent Magnitudes; With a Determination of the Time of Their Rotatory Motions on Their Axes. To Which is Added, a Measure of the Diameter of the Second Satellite, and an Estimate of the Comparative Size of All the Four. By William Herschel, LL.D. F. R. S.
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