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Model A · Kinetic orrery

The solar system, kept at its own pace

Model A is a wall-mounted orrery, 620 mm across. One motor drives nine geared rings, so Mercury through Pluto circle the Sun at their true relative periods, over an engraved map of 357 stars.

Shown: the front panel from the general assembly drawing, Rev. G.

Detail of the Model A front panel: an engraved star map with nine planet rings, the zodiac and a 360-degree scale

In development

An instrument for the wall

Model A is in its prototype stage. Photographs, pricing and the campaign date come with the announcement.

Nine planets

Each planet rides its own geared ring, from Mercury at 28 mm from the Sun to Pluto at 295 mm.

An engraved sky

357 stars in 55 constellations, with the ecliptic, the celestial equator and the horizon line.

A calendar ring

A 360° scale with the zodiac and the months runs around the edge, so each planet's place reads as a date.

Design specification · subject to change
Diameter620 mm
PlanetsNine, Mercury to Pluto
Gear train9 ring stages · 8,179 teeth
Star map357 stars · 55 constellations
Front panelAluminium, engraved
MountingWall
StatusPrototype