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
“The letters when joined together as they ought to be, say this,
‘Altissimum planetam tergeminum observavi,’
‘I have observed the most distant of the planets to have a triple
form.’
“For in truth I have found out with the most intense surprise
that the planet Saturn is not merely one single star, but three
stars very close together, so much so that they are all but in
contact one with another. They are quite immovable with regard to
each other, and are arranged in this manner, o◯o. The middle star
of the three is by far greater than the two on either side. They
are situated one towards the east, the other towards the west, in
one straight line to a hair’s-breadth; not, however, exactly in
the direction of the Zodiac, for the star furthest to the west
rises somewhat towards the north; perhaps they are parallel to
the equator. If you look at them through a glass that does not
multiply much, the stars will not appear clearly separate from one
another, but Saturn’s orb will appear somewhat elongated, of the
shape of an olive, thus, ☾☽. But if you should use a glass which
multiplies a surface more than a thousand times, there will appear
very distinctly three orbs, almost touching one another; and they
will be thought to be not farther apart than the breadth of a very
fine and scarcely visible thread. So you see a guard of satellites
has been found for Jupiter, and for the decrepit little old man two
servants to help his steps and never leave his side. Concerning the
rest of the planets I have found nothing new.”
So says Galileo; but if I may do so, I will not make an old dotard out
of Saturn, and two servants for him out of his companion orbs, but
rather out of those three united bodies I will make a triple Geryon,
out of Galileo Hercules, and out of the telescope his club, armed with
which, Galileo has conquered that most distant of the planets, drawn it
out of the furthest recesses of nature, dragged it down to earth, and
exposed it to the gaze of us all. It pleases me too, now that the nest
has been found, to consider with curiosity what kind of brood must
be in it, what kind of life, if there be any life there, between orbs
which all but touch each other two and two, where not even
“a space
Of sky extends not more than three ells wide,”[24]
but where there is scarcely a chink of a nail’s-breadth all round.
[24] Virgil, _Eclog._ iii. 105.
Public-domain text, read in full here on John Shaqi.
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