Theodor Graminaeus, Uberior enarratio eorum quae a Ioanne de Sacro Bosco proponuntur (Cologne, 1567), p. 54 (showing the reverse of an astrolabe, used to set the initial angle).
Theodor Graminaeus
Theodor Graminaeus, Uberior enarratio eorum quae a Ioanne de Sacro Bosco proponuntur (Cologne, 1567), p. 54 (showing the reverse of an astrolabe, used to set the initial angle).