Ptolemaic Solar System WatchParty like it's pre Copernican times with a retro (like, really retro) watch featuring the Ptolemaic Solar System on its face! With the Earth at the center, the planets on concentric rings, the Sun on the minute hand, the Moon on the hour hand, and the stars on the surrounding firmament, you'll always be at the center of the Universe. Watch face is 1. 3 inches across with a nickel free zinc alloy case and leather band, almost 9 inches total length.