Didactic model for the teaching of some astronomical geography issues: the model is composed of two conjunds contained and embryed in an armor, which represent two spherical coordinate systems. The first set is fixed and this constituted by a double horizontal plane that represents two horizons antipodas, a rod that represents the vertical of the place and a ring in representation of the vertical or vertical circles. Another ring, graded from 0g to 360g in a retrograde sense allows to read acimudes. A brake device with tabs allows the representative plate of the double horizontal plane to be stable. The second set, mobile regarding the first, consists of a rod that represents the axis of the poles, a ring that represents a meridian and to which the aros that represent the equatorial and tropical circles are subject. The basic innovation that characterizes the model and grants intelligibility and significant movement, are the two equal rates representative of a vertical and a meridian, graduated in opposite quadrants from 0g to 90g, expressing the concept of meridian of or meridiano it fulfills vertical and meridian conditions and allows a wide set of the other to always displace. (Machine-translation by Google Translate, not legally binding)
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