family, and
attracting numerous pupils. His constant aim was to accumulate a large
store of observations of a high order of accuracy, and thus to provide
data for the complete reform of astronomy. As we have seen, few of the
Danish nobles had any sympathy with Tycho's pursuits, and most of them
strongly resented the continual expense borne by the King's treasury.
Tycho moreover was so absorbed in his scientific pursuits that he would
not take the trouble to be a good landlord, nor to carry out all the
duties laid upon him in return for certain of his grants of income. His
buildings included a chemical laboratory, and he was in the habit of
making up elixirs for various medical purposes; these were quite
popular, particularly as he made no charge for them. He seems to have
been something of a homoeopathist, for he recommends sulphur to cure
infectious diseases "brought on by the sulphurous vapours of the Aurora
Borealis"!

King Frederick, in consideration of various grants to Tycho, relied
upon his assistance in scientific matters, and especially in
astrological calculations; such as the horoscope of the heir apparent,
Prince Christian, born in 1577, which has been preserved among Tycho's
writings. There is, however, no known copy in existence of any of the
series of annual almanacs with predictions which he prepared for the
King. In November, 1577, appeared a bright comet, which Tycho carefully
observed with his sextant, proving that it had no perceptible parallax,
and must therefore be further off than the moon. He thus definitely
overthrew the common belief in the atmospheric origin of comets, which
he had himself hitherto shared. With increasing accuracy he observed
several other comets, notably one in 1585, when he had a full equipment
of instruments and a large staff of assistants. The year 1588, which saw
the death of his royal benefactor, saw also the publication of a volume
of Tycho's great work "Introduction to the New Astronomy". The first
volume, devoted to the new star of 1572, was not ready, because the
reduction of the observations involved so much research to correct the
star places for refraction, precession, etc.; it was not completed in
fact until Tycho's death, but the second volume, dealing with the comet
of 1577, was printed at Uraniborg and some copies were issued in 1588.
Besides the comet observations it included an account of Tycho's system
of the world. He would not accept the Copernican system