Soon afterwards he purchased an edition of Ptolemy
in order to read up the subject of astronomy, to which,
and to mathematics, he devoted most of the remainder
of his three years’ course at Copenhagen.
His uncle next sent him to Leipzig to study law, but
he managed to continue his astronomical researches.
He obtained the Alphonsine and the new Prutenic Tables,
but soon found that the latter, though more accurate
than the former, failed to represent the true positions
of the planets, and grasped the fact that continuous
observation was essential in order to determine the
true motions. He began by observing a conjunction
of Jupiter and Saturn in August, 1563, and found the
Prutenic Tables several days in error, and the Alphonsine
a whole month. He provided himself with a cross-staff
for determining the angular distance between stars
or other objects, and, finding the divisions of the
scale inaccurate, constructed a table of corrections,
an improvement that seems to have been a decided innovation,
the previous practice having been to use the best
available instrument and ignore its errors. About
this time war broke out between Denmark and Sweden,
and Tycho returned to his uncle, who was vice-admiral
and attached to the king’s suite. The uncle
died in the following month, and early in the next
year Tycho went abroad again, this time to Wittenberg.
After five months, however, an outbreak of plague
drove him away, and he matriculated at Rostock, where
he found little astronomy but a good deal of astrology.
While there he fought a duel in the dark and lost
part of his nose, which he replaced by a composition
of gold and silver. He carried on regular observations
with his cross-staff and persevered with his astronomical
studies in spite of the objections and want of sympathy
of his fellow-countrymen. The King of Denmark,
however, having a higher opinion of the value of science,
promised Tycho the first canonry that should fall vacant
in the cathedral chapter of Roskilde, so that he might
be assured of an income while devoting himself to
financially unproductive work. In 1568 Tycho
left Rostock, and matriculated at Basle, but soon moved
on to Augsburg, where he found more enthusiasm for
astronomy, and induced one of his new friends to order
the construction of a large 19-foot quadrant of heavy
oak beams. This was the first of the series of
great instruments associated with Tycho’s name,
and it remained in use for five years, being destroyed
by a great storm in 1574. Tycho meanwhile had
left Augsburg in 1570 and returned to live with his
father, now governor of Helsingborg Castle, until
the latter’s death in the following year.
Tycho then joined his mother’s brother, Steen
Bille, the only one of his relatives who showed any
sympathy with his desire for a scientific career.