Terrestrial and celestial facsimile globe gores. Astronomical details on the gores date from 1550 and include a labelled magnitude table in front of Ursa Major. The Milky Way is labelled. There is data on the astrological associations of the planetary symbols. The 48 Ptolemaic constellations are depicted with an extensive nomenclature in Latin, Greek script and often the translation of the Arabic names, which are labelled.

A new style for drawing the constellation figures has been introduced on these gores. Mercator was the first to design his celestial gores in equatorial co-ordinates - a considerable undertaking - the reason for which, however, still eludes explanation. He is also the first globe maker to use the Copernician theory of trepidation for calculating the proper position of the stars. For full details about the cartography and construction of these gores please refer to the related publication, Globes at Greenwich.