It was not until the year 1603 that he undertook the preparation of a celestial globe to serve as a companion of his first terrestrial. This he dedicated, “Illustrissᵒ Principi ac Domiō D. Mauritio, Principi Auraico Comiti de Naussau etc., Marchioni Veriae et Flissingae etc., Domino suo Clementissimo, Hos astriferum, stellarum arte coelo deductarum, coelum Gratus M.O.D.D.C.Q. Guilielmus Jansonius Alcmarianus.” “To the Illustrious Prince and Lord D. Maurice, Prince of Orange, Count of Nassau, etc., Marquis of Veria and Flissingen, etc., his Most Benign Lord, this globe of the stars brought down from heaven by art is gratefully dedicated by its maker with dutiful mind. Willem Jansz. Alcmar.” In his title legend he makes particular reference to his teacher Tycho, which legend reads: “Sphaera stellifera. In qua ut speculo quondam firmamenti Universaum Syderū ornatum ac stellarum ordinem summa, qua fieri potuit, industria a Guilielmo Jansonio, magni Tychonis quondam discipulo, accuratissime disposititum: earumque numerum multo quam hactenus, auctiorem ex observationibus recens. a Nob. viro D. Tychone Brahe, astronomo incōparabili, habitis, depromta anno 1600, et quo deinceps seculo, accommodata intueri liceat.” “Celestial sphere. Herein as in a mirror all the stars of the firmament are depicted, and in proper order with the greatest possible industry and accuracy by Willem Janson the former pupil of the great Tycho: their number much increased from recent observations made by the noble D. Tycho Brahe, that incomparable astronomer, taken from his observations made in the year 1600, and made with an accommodation for the coming century.” Near this cartouch is a portrait of the great astronomer with his favorite motto, “Non haberi, sed esse.” Near the south pole we find a reference to recent astronomical discoveries in the following words: “Habetis hic, Astronomum studiosi, trecentas et plures antarctici mundi vertici viciniores stellas, ex observationibus secundum jam a Frederico Houtmanno, majori studio et accommodatioribus instrumentis, ad stellas a Tychone positas factis, depromptas: auctiori numero et accuratiori dispositione vestro commodo et delectationi depictas A. 1603.” “Thou hast here, O student of astronomy, more than three hundred stars, that are nearest the pole of the antarctic world, from the observations made by Frederick Houtmann with further study and with more suitable instruments, along with the stars that were located by Tycho: this increased number and this more accurate location having been set down for your use and delight in the year 1603.” He adds here and there a brief legend in which he directs attention to recently discovered stars.