In 1588, Tycho's royal benefactor died, and a volume of Tycho's great two-volume work "Astronomiae Instauratae Progymnasmata" ("Introduction to the New Astronomy") was published. The first volume, devoted to the new star of 1572, was not ready, because the reduction of the observations of 1572–3 involved much research to correct the stars' positions for refraction, precession, the motion of the Sun etc., and was not completed in Tycho's lifetime (it was published in Prague in 1602/03), but the second volume, titled "De Mundi Aetherei Recentioribus Phaenomenis Liber Secundus" ("Second Book About Recent Phenomena in the Celestial World") and devoted to 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. The third volume was intended to treat the comets of 1580 and following years in a similar manner, but it was never published, nor even written, though a great deal of material about the comet of 1585 was put together and first published in 1845 with the observations of this comet.