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 were in view, of which two were east and the third west of Jupiter; this one was distant 3′ from the planet. On the east side the satellite in the middle was at a distance of 5′ 20″; the further satellite was 6′ beyond; they were arranged in a straight line, and were of the same size. At the fifth hour the arrangement was nearly the same, with this difference only, that the fourth satellite was emerging on the east side near Jupiter. It was smaller than the rest, and was then at a distance of 0' 30″ from Jupiter; but was raised a little above the straight line towards the north, as the accompanying figure shows (Fig. 26).

Jan. 27, 1h. after sunset, a single satellite only was in view, and that on the east side of Jupiter in this position (Fig. 27). It was very small, and at a distance of 7′ from Jupiter.

Jan. 28 and 29.—Owing to the intervention of clouds, I could make no observation.

Jan. 30.—At the first hour of the night the satellites were in view, arranged in the following way (Fig. 28). There was one satellite on the east side, at a distance of 2′ 30″ from Jupiter; and there were two satellites on the west, of which the one nearer to Jupiter was 3′ off the planet, and the other satellite 1′ further. The places of the outer satellites and Jupiter were in the same straight line; but the satellite in