Regiomontanus

标签:
文化 |
分类: 天 文 历 法 |
Regiomontanus
Born 6 June 1436(1436-06-06)
Unfinden, now part of Königsberg, Bavaria
Died 6 July 1476(1476-07-06) (aged 40)
Rome
Nationality German
Fields Mathematics
Doctoral advisor Georg von Peuerbach
Basilios Bessarion
Doctoral students Domenico Novara da Ferrara
Johannes Müller von Königsberg (6 June 1436 – 6 July 1476), known
by his Latin pseudonym Regiomontanus, was a German mathematician,
astronomer, astrologer and translator.
He was born in the Franconian village of Unfinden (now part of Königsberg, Bavaria) — not in the more famous East-Prussian Königsberg.
He is also called Johannes Müller, der Königsberger (Johannes Müller of Königsberg). His full Latin name was Joannes de Regio monte, which abbreviated to Regiomontanus (from the Latin for "Königsberg", "King's Mountain").
Plaque at Regiomontanus' birthplace
Life
At eleven years of age, he became a student at the university in
Leipzig, Saxony. Three years later he continued his studies at Alma
Mater Rudolfina, the university in Vienna, Austria. There he became
a pupil and friend of Georg von Peurbach. In 1457 he graduated with
a degree of "magister artium" (Master of Arts) and held lectures in
optics and ancient literature. He built astrolabes for Matthias
Corvinus of Hungary and Cardinal Bessarion, and in 1465 a portable
sundial for Pope Paul II. His work with Peurbach brought him to the
writings of Nicholas of Cusa (Cusanus), who held a heliocentric
view. Regiomontanus, however, remained a geocentrist after Ptolemy.
Following Peurbach's death, he continued the translation of
Ptolemy's Almagest which Peurbach had begun at the initiative of
Basilios Bessarion. From 1461 to 1465 Regiomontanus lived and
worked at Cardinal Bessarion's house in Rome. He wrote De
Triangulis omnimodus (1464) and Epytoma in almagesti Ptolemei. De
Triangulis (On Triangles) was one of the first textbooks presenting
the current state of trigonometry and included lists of questions
for review of individual chapters. In it he wrote:
"You who wish to study great and wonderful things, who wonder about
the movement of the stars, must read these theorems about
triangles. Knowing these ideas will open the door to all of
astronomy and to certain geometric problems."
In the Epytoma he critiqued the translation, pointing out
inaccuracies. Later Nicolaus Copernicus would refer to this book as
an influence on his own work. In 1467 Regiomontanus left Rome to
work for János Vitéz, archbishop of Esztergom, and later at the
court of Matthias Corvinus of Hungary. There he calculated
extensive astronomical tables and built astronomical
instruments.
In 1471 he moved to the Free City of Nuremberg, in Franconia, then
one of the Empire's important seats of learning, publication,
commerce and art. He associated with the humanist and merchant
Bernhard Walther who sponsored the observatory and the printing
press. Regiomontanus remains famous for having built at Nuremberg
the first astronomical observatory in Germany. In 1472 he published
the first printed astronomical textbook, the "Theoricae novae
Planetarum" of his teacher Georg von Peurbach. Peurbach worked at
the Observatory of Großwardein (Oradea) in Transylvania, the first
in Europe, and established in his "Tabula Varadiensis" this
Transylvanian town's observatory as lying on the prime meridian of
Earth.
In 1475 he went to Rome to work with Pope Sixtus IV on calendar
reform. On the way he could publish his "Ephemeris" in Venice.
Regiomontanus died mysteriously in Rome, July 6, 1476, a month
after his fortieth birthday. Some say he died of plague, others by
(more likely) assassination.
A prolific author, Regiomontanus was internationally famous in his
lifetime. Despite having completed only a quarter of what he had
intended to write, he left a substantial body of work. Nicolaus
Copernicus' teacher, Domenico Maria Novara da Ferrara, referred to
Regiomontanus as having been his own teacher.
It is not true that Regiomontanus came to be called after the Latin
name of his place of birth, Königsberg, Bavaria, posthumously. In
his time, it was common for scholars to Latinize their names in
their publications.
In 1561, Daniel Santbech compiled a collected edition of the works
of Regiomontanus, De triangulis planis et sphaericis libri quinque
(first published in 1533) and Compositio tabularum sinum recto, as
well as Santbech's own Problematum astronomicorum et geometricorum
sectiones septem. It was published in Basel by Henrich Petri and
Petrus Perna.
The crater Regiomontanus on the Moon is named after him.
Astrology
One biographer has claimed to have detected a decline in
Regiomontanus' interest in astrology over his life, and came close
to asserting that Regiomontanus had rejected it altogether. But
more recent commentators have suggested that the occasional
expression of skepticism about astrological prognostication
reflected a disquiet about the procedural rigour of the art, not
about its underlying principles. It seems plausible that, like some
other astronomers, Regiomontanus concentrated his efforts on
mathematical astronomy because he felt that astrology could not be
placed on a sound footing until the celestial motions had been
modeled accurately.
In his youth, Regiomontanus had cast horoscopes (natal charts) for famous patrons. His Tabulae directionum, completed in Hungary, were designed for astrological use and contained a discussion of different ways of determining astrological houses. The calendars for 1475-1531 which he printed at Nuremberg contained only limited astrological information—a method of finding times for bloodletting according to the position of the moon; subsequent editors added material.
But perhaps the works most indicative of Regiomontanus' hopes for an empirically sound astrology were his almanacs or ephemerides, produced first in Vienna for his own benefit, and printed in Nuremberg for the years 1475-1506. Weather predictions and observations were juxtaposed by Regiomontanus in his manuscript almanacs, and the form of the printed text enabled scholars to enter their own weather observations in order to likewise check astrological predictions; extant copies reveal that several did so.
Regiomontanus' Ephemeris would be used in 1504, by a Christopher Columbus stranded for a year on Jamaica, to intimidate the natives into continuing to provision him and his crew from their own scanty food stocks. Columbus accomplished this when he successfully predicted a lunar eclipse for 29 February 1504.[1]
Regiomontanus did not live to produce the special commentary to the ephemerides that he had promised would reveal the advantages the almanacs held for the multifarious activities of physicians, for human births and the telling of the future, for weather forecasting, for the inauguration of employment, and for a host of other activities, although this lack was again made good by subsequent editors. Nevertheless Regiomontanus' promise suggests that he was convinced of the validity and utility of astrology as his contemporaries.
It seems more than plausible that Regiomontanus did believe in astrology, as he invented his personal method of sky map dividing, also known as house, Regiomontanus house system.
Criticism
Much of the material on spherical trigonometry in Regiomontanus' On
Triangles was taken directly and without credit from the
twelfth-century work of Jabir ibn Aflah otherwise known as Geber,
as noted in the sixteenth century by Gerolamo Cardano.[2]