Fr.: modèle tychonique
A hybrid of → geocentric and → heliocentric systems in which the Earth remains at the center, with the → Sun orbiting the Earth, but with all the other planets revolving about the Sun. Moreover, the fixed stars were located in a crystalline shell centered on the Earth.
Related to the Danish astronomer Tycho Brahe (1546-1601), who imagined the model; → model.