The sidereal messenger of Galileo Galilei : $b and a part of the preface to Kepler's Dioptrics containing the original account of Galileo's astronomical discoveriesGalilei, Galileo
History
The sidereal messenger of Galileo Galilei : $b and a part of the preface to Kepler's Dioptrics containing the original account of Galileo's astronomical discoveries
Galilei, Galileo
Astronomy -- Early works to 1800; Jupiter (Planet) -- Satellites
On the last day of the month, at the second hour, two satellites on
the east side were visible, and one on the west (Fig. 29). Of the
satellites east of the planet, the one in the middle was 2´ 20´´
distant from Jupiter; and the satellite further to the east was 0´ 30´´
from the middle satellite; the satellite on the west was at a distance
of 10´ from Jupiter. They were in the same straight line nearly, and
would have been exactly so, only the satellite on the east nearest to
Jupiter was raised a little towards the north. At the fourth hour, the
two satellites on the east were 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.
Feb. 2.—The satellites were seen arranged thus (Fig. 32). There was one
only on the east, at a distance 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 4´ from the next; this satellite was 1´ 40´´ from Jupiter;
Jupiter was 6´ from the nearest satellite on the west, and this one
from the satellite further to the west, 8´; and they were all alike in
the same straight line, drawn in the direction of the Zodiac.
Feb. 3: 7 h.—The satellites were arranged in the following way (Fig.
34):—The satellite on the east was at a distance of 1´ 30´´ from
Jupiter; the nearest satellite on the west, 2´, and there was a
long distance, 10´, from this satellite to the satellite further to
the west. They were exactly in the same straight line, and of equal
magnitude.
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