Later I'll be including the details of how to construct an astrolabe. For now, here are some precomputed examples. To make a working astrolabe, copy the rete onto a transparency, then place a pin through the center of the rete and one of the plates. The centers are marked by a dot. The stars are identified numbers and listed in a separate text file.
Another set of drawings to a different scale for an astrolabe for 45 degrees North latitude can be found here.
Rete:
Plate for 31.5 deg North Latitude (Jerusalem):
Plate for 50 deg North Latitude (Hastings):
