than forty small stars. I have noticed thirty-six stars, besides the Aselli, arranged in the order of the accompanying diagram.
Discovery of Jupiter's satellites, Jan. 7, 1610: record of Galileo's observations during two months.I have now finished my brief account of the observations which I have thus far made with regard to the Moon, the Fixed Stars, and the Galaxy. There remains the matter, which seems to me to deserve to be considered the most important in this work, namely, that I should disclose and publish to the world the occasion of discovering and observing four PLANETS, never seen from the very beginning of the world up to our own times, their positions, and the observations made during the last two months about their movements and their changes of magnitude; and I summon all astronomers to apply themselves to examine and determine their periodic times, which it has not been permitted me to achieve up to this day, owing to the restriction of my time. I give them warning however again, so that they may not approach such an inquiry to no purpose, that they will want a very accurate telescope, and such as I have described in the beginning of this account.
On the 7th day of January in the present year, 1610, in the first[1] hour of the following night, when I- ↑ The times of Galileo's observations are to be understood as reckoned from sunset.
