Van Cleef & Arpels’ Midnight Planétarium timepiece features a mechanical orrery integrated in the watch face. It is only US$214,000. From the company:
The movement of each planet is true to its genuine length of orbit: it will take Saturn over 29 years to make a complete circuit of the dial, Jupiter will take almost 12 years, Mars 687 days, Earth 365 days, Venus 224 days and Mercury 88 days…
44 mm pink gold case; pink gold bezel; aventurine dial, pink gold sun and shooting star, serpentine Mercury, chloromelanite Venus, turquoise Earth, red jasper Mars, blue agate Jupiter, sugilite Saturn. Pink gold crown with sapphire case back. Matte black alligator strap with pink gold folding clasp. Self-winding mechanical movement (Stern Manufacture), equipped with a Christiaan Van der Klaauw module developed exclusively for Van Cleef & Arpels, 48 hour power reserve. Numbered edition
Midnight Planétarium Watch (via @pickover)