A simplified version of the front dial of the Antikythera mechanism, a intircate model of the solar system build in Greece around 200BC.

The hexes around the Critelli are the Luna Phase Display.
Around the mechanism the symbols of the twelve constellations of the Zodiak are marked.
arm1 and arm2 show the position of the the Sun and The Moon on the Celestial sphere, doubeling as indicators for the prgression of both solar year and lunar month.