The Sidereal Messenger of Galileo Galilei : And a Part of the Preface to Kepler's Dioptrics Containing the Original Account of Galileo's Astronomical Discoveries

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At the fourth hour, the two satellites on the east w^ere still nearer together, for they were only 20" apart (Fig. 30).
The western satellite appeared rather small in these two observations.
Feb. 1. — At the second hour of the night the arrangement was similar (Fig. 31). The satellite furthest to the east was at a distance of 6' from Jupiter, and the western satellite 8^ On the east side there was a very small satellite, at a distance of 20" from Jupiter. They made a perfectly straight line.
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...b. 2. — The satellites were seen arranged thus (Fig. 32). There was one only on the east, at a dis- THE SIDEREAL MESSENGER. 57 tance of 6' from Jupiter. Jupiter was 4' from the nearest satellite on the west ; between this satellite and the satellite further to the west there was an interval of 8' ; they were in the same straight line exactly, and were nearly of the same magnitude.
But at the seventh hour four satellites were there — two on each side of Jupiter (Fig. 33). Of these satellites, the most easterly was at a distance of a!


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