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Simon Marius
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Simon Marius
(1573-1624)
Marius
[1]
was born in Gunzenhausen
in the territory of the Markgrafschaft of Ansbach (south Germany).
His father
was mayor of the city in 1576. From 1586 to 1601, he studied (with interruptions)
at the Markgrafschaft's Lutheran academy at Heilsbronn. During this
period he
became interested in astronomy, and his astronomical and meteorological
observations began in 1594. In 1596 he wrote a tract on the comet of that
year, and in 1599 he published a set of astronomical tables. These efforts
resulted in his appointment as mathematician of the
Markgrafschaft of Ansbach,
in 1601. In that capacity he printed prognostications each year until
his death. One of his first acts as the Markgrafschaft's
mathematician was to
travel to Prague to learn
Tycho Brahe's
observational
techniques and instruments. Brahe died that year, and Marius's stay in
Prague lasted only four months. But he did meet
David
Fabricius
there. He then went to Padua to study at the university
there. He quickly became active in the German student association, the
"German Nation," there and was its head in 1604-1605.
In 1602 Marius began tutoring Baldessar Capra (a rich
student from Milan) in mathematics and astronomy. The two observed the
nova of 1604, and with Marius's help Capra published a book on that new
star. In 1607 Capra published under his own name Galileo's instruction
manual on the
sector
, which circulated
in manuscript. For this Capra was expelled from the university. It appears
that Marius had an important role in this plagiarism, but he had returned
to his native land in 1605. In Italy, however, Marius's reputation was
tarnished by this fraud and by certain other questionable practices as
head of the German Nation.
Upon his return from Italy, Marius settled in the
city of Ansbach as court mathematician and married Felicitas Lauer, the
daughter of his publisher. In 1609 he published the first German translation
(from the Greek) of the first six books of Euclid's
Elements.
But
Marius's most memorable (and controversial) research involved the telescope.
In the fall of 1608, Marius learned from an artillery
officer that at the Frankfurt Fair a Dutchman had tried to sell him a
spyglass (see
telescope
). Together
the two quickly reproduced the device by using spectacle lenses but it
was not until at least a year later that Marius obtained instruments good
enough for astronomical observations. Marius's oldest surviving observation
of
Jupiter's satellites
dates from the end of December 1610. In his prognostications for 1612,
finished in March 1611, he stated that he had observed Jupiter's moons
since December 1609 and was busy determining the periods of the satellites.
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Title page of Mundus Iovialis
[click for larger image]
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In 1614 Marius published the fruits of his research
on Jupiter in a book entitled
Mundus Iovialis anno M.DC.IX Detectus
Ope Perspicilli Belgici
("The Jovian World, discovered in 1609 by
means of the Dutch Telescope"), in which he claimed that he had observed
Jupiter's moons beginning as early as late November 1609 and had begun
recording his observations on 29 December. Now Marius was using the Julian
calendar, and this date corresponds to 8 January on the Gregorian calendar.
Since Marius did not publish any observations, as
Galileo had done in his
Sidereus Nuncius
, it is impossible to verify
Marius's claim. His reputation was, however, not the highest. Galileo
responded to Marius's claim in his
Assayer
of 1623. He began by
complaining about those who had tried to steal his inventions and then
took aim at Marius:
Of such usurpers I might name not a few, but
I shall pass them over now in silence, as it is customary for first offenses
to receive less severe punishment than subsequent ones. But I shall not
remain silent any longer about a second offender who has tried too audaciously
to do me the very same thing which he did many years ago by appropriating
the invention of my geometric compass, despite the fact that I had many
years previously shown it and discussed it before a large number of gentlemen
and had finally made it public in print. May I be pardoned this if, against
my nature, my habit, and my present intentions--I show resentment and
cry out, perhaps with too much bitterness, about a thing which I have
kept to myself these many years. I speak of Simon Marius of Gunzenhausen;
he it was in Padua, where I resided at the time, who set forth in Latin
the use of the said compass of mine and, appropriating it to himself,
had one of his pupils print this under his name. Forthwith, perhaps to
escape punishment, he departed immediately for his native land, leaving
his pupil in the lurch as the saying goes; and against the latter, in
the absence of Simon Marius, I was obliged to proceed in the manner which
is set forth in the
Defense
which I then wrote and published. Four
years after the publication of my
Sidereal Messenger
, this same
fellow, desiring as usual to ornament himself with the labors of others)
did not blush to make himself the author of the things I had discovered
and printed in that work. Publishing under the title of
The Jovian
World
, he had the temerity to claim that he had observed this Medicean
planets which revolve about Jupiter before I had done so. But because
it rarely happens that truth allows herself to be suppressed by falsehood,
you may see how he himself, through his carelessness and lack of understanding,
gives me in that very work of his the means of convicting him by irrefutable
testimony and revealing unmistakably his error, showing not only that
he did not observe the said stars before me but even that he did not certainly
see them until two years afterwards; and I say moreover that it may be
affirmed very probably that he never observed them at all.
[2]
After making an argument about the inclinations of
the orbits of the satellites to the ecliptic, Galileo turned his attention
to the date on which Marius claimed to have discovered the satellites:
Next, notice the craft with which he tries
to show himself prior to me. I wrote in my
Sidereal Messenger
of
making my first observation on the seventh of January, 1610, continuing
then with others on the succeeding nights. Along comes Marius, and, appropriating
my very observations, he prints in the title page of his book and again
in the opening part of his work that he had already made his observations
in the year 1609, trying to give people the idea that he was first. Now
the earliest observation that he produces as made by him is the second
one made by me; yet he announces it as made in the year 1609. What he
neglects to mention to the reader that since he is outside our church
and has not accepted the Gregorian calendar, the seventh day of January
of 1610 for us Catholics, is the same as the twenty-eighth day of December
of 1609 for those heretics. So much for the priority of his pretended
observations.
[3]
Galileo perhaps went a bit overboard. It appears certain
that Marius was observing Jupiter's moons by December 1610. Yet, Marius
did not produce any actual observations of the moons in his book, and
the few examples he gives all date from 1613. Regardless of this priority
question, Marius was the first to publish tables here of the motions of
the satellites.
Mundus Iovialis
also contains a telescopic discovery
whose priority has never been disputed: in 1612 he was the first to observe
the Andromeda nebula, which could not be resolved into stars at that time.
From several remarks in his works, it appears that
Marius was a militant Lutheran. He corresponded with
David
Fabricius
and Kepler's former teacher Michael Maestlin, both Lutherans,
and he defended (Lutheran)
Tycho Brahe's
world system on scriptural as well as astronomical and physical grounds.
Besides his annual prognostications, he published in his later years a
book on the comets of 1618 and, posthumously, a book on
Ptolemy's
position circle. He died in Ansbach after a brief illness in 16124.
Notes
:
[1]
His name has often been rendered as Mayr or Mayer by
English and American writers, after the German family name. He is referred to
by modern Germans, however, as Marius, and I have followed this usage.
[2]
Galileo,
The Assayer
, tr. Stillman Drake, in
Stillman Drake and C. D. O'Malley,
The Controversy on the Comets of 1618
(Philadelphia: University of Pennsylvania Press, 1960), pp. 164-165. In this
and the next citation, I have made minor changes in the translations.
[3]
Ibid.
, p. 167-168. For the priority dispute, see
J. H. Johnson, "The Discovery of the First Four Satellites of Jupiter,"
Journal of the British Astronomical Association
41(1930-31):164-171,
and Pietro Pagnini, "Galileo and Simon Mayer,"
Journal of the British
Astronomical Association
41(1930-31):415-422.
Sources
: Edward Rosen, "Mayr (Marius), Simon,"
Dictionary of Scientific
Biography,
IX:247-248. For a partial translation of
Mundus
Iovialis
, see A. O. Prickard, "The `Mundus Jovialis' of Simon Marius,"
The Observatory,
39 (1916): 367-381, 403-412, 443-452, 498-504.
Images
: Portrait: Simon Marius,
Mundus Iovialis
(1614), frontispiece.
Title Page:
ibid.
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