page_title: Eise Eisinga Planetarium
section_title: Orrery
hierarchical_section_title: Eise Eisinga Planetarium / Orrery
caption_attribution_description: English: Eise Eisinga Planetarium in Franeker, built 1774 to 1781
context_page_description: The Royal Eise Eisinga Planetarium is an 18th-century orrery in Franeker, Friesland, Netherlands. It is currently a museum and open to the public. The orrery has been on the top 100 Dutch heritage sites list since 1990 and in December 2011 was placed on a provisionary list of future UNESCO World Heritage Site candidates. It is the oldest working orrery in the world.
context_section_description: An orrery is a planetarium, a working model of the solar system.  The orrery is painted with royal blue glimmer and outlined in shiny gold paint.  The sun is painted at the center of the ceiling.  The Earth is represented by a golden orb dangling on a wire.  The zodiac is also depicted.  The clockwork-like mechanical planetarium moves as it does in reality at a reduced scale. The pendulum in the orrery is made of a single type of medal.
  The "face" of the model looks down from the ceiling of what used to be his living room, with most of the mechanical works in the space above the ceiling. It is driven by a pendulum clock, which has 9 weights or ponds. The planets move around the model in real time, automatically. (A slight "re-setting" must be done by hand every four years to compensate for the February 29th of a leap year.) The planetarium includes a display for the current time and date. The plank that has the year numbers written on it has to be replaced every 22 years.
  The Eise Eisinga Planetarium is the oldest still working planetarium in the world.
  To create the gears for the model, 10,000 handmade nails were used.
  In addition to the basic orrery, there are displays of the phase of the moon and other astronomical phenomena.
  The orrery was constructed to a scale of 1:1,000,000,000,000 (1 millimetre: 1 million kilometres).
caption: The orrery
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