Three years later, that is, in 1602, Blaeu issued a terrestrial and a celestial globe, each having a diameter of 23 cm. He refers to his terrestrial globe as an improvement upon that of 1599, referring doubtless to its geographical details and not to its size. He dedicates his work to the three provinces, Holland, Zeeland and West Friesland, calls especial attention to the recent expedition of Olivier van der Noort, the course of whose expedition around the world he lays down on his map, and signs himself Guilielmo Jansonio Blaeu, substituting his family name for the name of his birthplace. On his celestial globe of 1602 he located the stars in accord with the reckoning of the year 1600, making use, as he states, of the observations of his friend and teacher, Tycho Brahe, but for the southern constellations the observations of the explorer Fredrik Houtman.[35] By reason of the fact that so few copies of these globes of 1602 are known to exist, it has been thought that for some reason Blaeu issued a very limited number. We know, however, that his terrestrial globes were highly valued and much in demand, because of the care with which they had been prepared, because of his effort to give information concerning the latest discoveries, and because of his representation of the loxodrome lines which made them of special service to navigators; that his celestial globes found favor by reason of the fact that he was known to be a pupil and friend of Tycho Brahe; and that he himself was known to be a mathematician and astronomer of distinction. In 1603, he undertook the preparation of a celestial globe to be considered a companion of his first globe of 1599. From the observations of Brahe and of Houtman he tells us as in his work of the preceding year, that he derived many of his details, and he honors the former by giving his portrait a conspicuous position in his map, adding his master’s favorite motto: “Non haberi, sed esse.”