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302 which he mentioned that he expected his sister Sophia. Neither she nor Rosenkrands came, however, to the wedding, which was celebrated on the 17th June, after which the married couple set out for Westphalia, the home of the bridegroom, accompanied by Eriksen.

Tengnagel does not seem to have occupied himself much with astronomy, and probably did not take an active part in the scientific work in Tycho's house. At Prague, Tycho had not as many assistants as at Hveen. In addition to Longomontanus, Müller, and Eriksen, he was assisted for some time by Melchior Joestelius, Professor of Mathematics at Wittenberg; by Ambrosius Rhodius, who left Prague shortly before Tycho's death, and likewise became Professor at Wittenberg; by a certain Matthias Seiffart, who afterwards for some years assisted Kepler in computing and observing; and from June 1601 by a young Dane, Poul Jensen Colding. It appears also that Simon Marius (Mayer), who afterwards obtained some notoriety by laying claim to various discoveries and inventions long after they had been published by others, spent some time at Prague with Tycho and Kepler in the summer of 1601. The Imperial physician, Hagecius, with whom Tycho had corresponded for so many years, died on the 1st September 1600,