Tycho Brahe in front of his house in Copenhagen. Tycho Brahe left Hven in 1597, bringing some of his instruments with him to Copenhagen, and entrusting others to a caretaker on the island. Shortly before leaving, he completed his star catalogue giving the positions of 1,000 stars. After some unsuccessful attempts at influencing the king to let him return, he finally acquiesced to exile, but he wrote his most famous poem "Elegy to Dania" in which he chided Denmark for not appreciating his genius. The instruments he had used in Uraniborg and Stjerneborg were depicted and described in detail in his book
Gellio Sasceride erat splendidum" ("[my] debut was excellent"). In 1590, Sasceride had sent to Galileo the only copy of a book until then found in Italy detailing the heliocentric system. The crater Sasserides on the Moon is named after him. It lies near Tycho, named after Tycho Brahe. Gellio Sasceride Gellio Sasceride (Sasserides) (1562–1612) was a Danish astronomer and medical doctor. Sasceride was born in Copenhagen. He worked as an assistant to Tycho Brahe after studying under him. It is believed that the following words were written by Sasceride to Brahe: "Quia adhuc aliquid superest spatii, quae sequuntur paucula, sic expetente typographo,