Page:The sidereal messenger of Galileo Galilei.pdf/89

 east. They were all in the same straight line exactly, and of the same magnitude, as may be seen in the accompanying diagram (Fig. 44).

Feb. 12: 0 h. 40 m.—A pair of satellites on the east, a pair likewise on the west, were near the planet (Fig. 45). The satellite on the east furthest removed from Jupiter was at a distance of 10′, and the further of the satellites on the west was 8′ off. They were both fairly distinct. The other two were very near to Jupiter, and very small, especially the satellite to the east, which was at a distance of 0′ 40″ from Jupiter. The distance of the western satellite was 1′. But at the fourth hour the satellite which was nearest to Jupiter on the east was visible no longer.

Feb. 13: 0 h. 30 m.—Two satellites were visible in the east, two also in the west (Fig. 46). The satellite on the east near Jupiter was fairly distinct; its distance from the planet was 2′. The satellite further to the east was less noticeable; it was distant 4′ from the other. Of the satellites on the west, the one furthest from Jupiter, which was very distinct, was parted from the planet 4′. Between this satellite and Jupiter intervened a small satellite close to the most westerly satellite, being not more than 0′ 3″ off. They were all in the same straight line, corresponding exactly to the direction of the ecliptic.