The Ulysse Nardin Executive Moonstruck Worldtimer shows the time and movements of the Moon and Sun in relation to the Earth
A planetarium is described as a theater built for presenting astronomy and the night sky. A planetarium in or on a watch is also called orrery and often a mechanical model of the solar system showing the relative positions and motions of the planets and moons.
The first orrery was invented around 1704 by George Graham, who also founded the watch brand Graham, and Thomas Tompion. George Graham (7 July 1673 – 20 November 1751) was an English clockmaker, inventor, and geophysicist. Thomas Tompion (1639–1713) was an English clockmaker, watchmaker and mechanician who is regarded as the Father of English Clockmaking.
Watches with a planetarium
A mouth full: the Bovet Récital 20 Astérium 10-day Flying Tourbillon Night Sky Annual Calendar with Astronomical Functions
This Graham Geo. Graham Orrery Tourbillon is a homage to George Graham who invented the orrery (together with Thomas Tompion)
A tourbillon, moon phase and day/night indicator with a stunning 3D view: the Girard-Perregaux Planetarium Tri-Axial