The model for this reproduction is an unsigned astrolabe made around 1500 with a diameter of 197 mm. It may have been made by Georg Hartmann in Nuremberg. The bird-headed star points, the letters used and the design all point to this scholar and compass maker.
The reproduction is scaled down and fixed for the geographic latitude 48° or 52°; it therefore has no insert plates. Engraved are 4° almucantars, 10° azimuth lines, unequal hours and astrological houses. For better orientation, the almucantars 20°, 40°, 60° and 80° are highlighted by a thicker line.
The narrow limb on the front bears a 360° graduation; a 2 x 12 hour graduation cannot be included for reasons of space. Hours 1-16 can be found on the Capricornus ring of the rete. To read the hours, the rete must be rotated so that the zero point of the hour scale is at 0° or 180° of the graduation in Scorpio.
The complete description of the instrument as PDF for download
