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Rh received observations from his former pupils, Longomontanus, who at that time was staying at Rostock, and Christen Hansen of Ribe, who observed it in Jutland, and who had formerly observed the comet of 1593 at Zerbst. It appears that Tycho got some kind of information about this eclipse from somebody at Hveen, perhaps from David Petri (Pedersen), whom he had left in charge of the buildings and other property on the island, as Tycho afterwards wrote both to Magini and Kepler that the eclipse had been observed at Hveen from beginning to end (while only the beginning was seen at Wandsbeck owing to clouds), and that the time of beginning and end agreed well with his own tables. With the exception of this eclipse of the sun and two of the moon, and a few meridian altitudes of the sun, the planets only were observed at Wandsbeck. Tycho felt that the thousand star-places were enough to have to show to the world, and he felt that observations of the planets were of greater value to complete the material accumulated at Hveen. He was assisted at Wandsbeck by Johannes Müller, mathematician to the Elector of Brandenburg, who had visited him at Hveen in 1596, and whom he was requested by the Electress to train not only in chemistry but also in the