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 the east, distant 3′ from Jupiter; the other on the west, distant 10′ (Fig. 51). The latter was somewhat less than the satellite on the east; but at the sixth hour the eastern satellite was nearer to Jupiter, being at a distance of 0′ 50″, and the western satellite was further off, namely 12′. At both observations they were in the same straight line with Jupiter, and were both rather small, especially the eastern satellite in the second observation.

Feb. 18: 1 h.—Three satellites were in view, of which two were on the west and one on the east; the distance of the eastern satellite from Jupiter was 3′, and of the nearest satellite on the west 2′; the remaining satellite, still further to the west, was 8′ from the middle satellite (Fig. 52). They were all in the same straight line exactly, and of about the same magnitude. But at the second hour the satellites nearest to the planet were at equal distances from Jupiter, for the western satellite was now also 3′ from the planet. But at the sixth hour the fourth satellite was visible between the satellite on the east and Jupiter, in the following configuration (Fig. 53). The satellite furthest to the east was at a distance of 3′ from the next in order; this one was at a distance of 1′ 50″ from Jupiter; Jupiter was at a distance of 3′ from the next satellite on the west, and this 7′ from the satellite