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Tycho's Birth, Family, and Education An Eclipse of the Sun turns his attention to Astronomy Studies Law at Leipsic But pursues Astronomy by stealth His Uncle's Death He returns to Copenhagen, and resumes his Observations Revisits Germany Fights a Duel, and loses his Nose Visits Augsburg, and meets Hainzel Who assists him in making a large Quadrant Revisits Denmark And is warmly received by the King He settles at his Uncle's Castle of Herritzvold His Observatory and Laboratory Discovers the new Star in Cassiopeia Account of this remarkable Body Tycho's Marriage with a Peasant Girl Which irritates his Friends His Lectures on Astronomy He visits the Prince of Hesse Attends the Coronation of the Emperor Rudolph at Ratisbon He returns to Denmark.

Hainzel is interesting from its curious outline; Cichus for the huge yawning crater on its eastern wall; Capuanus for a brilliant shining crater also on its eastern wall; and Mercator for possessing bright craters on both its east and its west walls. Vitello has a bright central mountain and gains conspicuousness from its position at the edge of the dark Mare Humorum.

While he was transferring the first rude conception of his instrument to paper, Paul Hainzel entered his study, and was so struck with the grandeur of the plan, that he instantly undertook to have it executed at his own expense.

In order, however, that he might have one good instrument in his observatory, he constructed a sextant similar to, but somewhat larger than, that which he had presented to Hainzel. Its limb was made of solid brass, and was exquisitely divided into single minutes of a degree.

After receiving a visit from the celebrated Peter Ramus, who subsequently fell a victim at the massacre of St Bartholomew, Tycho left Augsburg, having received a promise from his friend Hainzel that he would communicate to him the observations made with his large quadrant, and with the sextant which he had given him in a present.

HAINZEL. This remarkable formation, which is about 55 miles in greatest length, but is hardly half so broad, derives its abnormal shape from the partial coalescence of two nearly equal ring-plains, the walls of both being very lofty, more than 10,000 feet. It ought to be observed under a morning sun when the floor is about half illuminated.

The date of its first appearance has not been exactly ascertained. Tycho saw it on the 11th November, but Cornelius Gemma had seen it on the 9th, Paul Hainzel saw it on the 7th of August at Augsburg, and Wolfgangus Schulerus observed it at Wittenberg on the 6th.

Among the interesting acquaintances which he formed at Augsburg, were two brothers, John and Paul Hainzel, the one a septemvir, and the other the consul or burgomaster. They were both distinguished by their learning, and both of them, particularly Paul, were ardent lovers of astronomy.

Hainzel is flanked on the W. and S.W. by a broad plateau, W. of which stand two ring-plains about 15 miles in diameter, both having prominent central mountains and bright interiors. WILHELM I. A large irregular formation, about 50 miles across, S.E. of Heinsius, with walls varying very considerably in height, rising more than 11,000 feet on the E., but only about 7000 feet on the opposite side.

The projected instrument was a quadrant of fourteen cubits radius! and Tycho and his friend entered upon its construction with that intense ardour which is ever crowned with success. In the village of Gegginga, about half a mile to the south of the city, Paul Hainzel had a country house, the garden of which was chosen as the spot where the quadrant was to be fixed.