Contest #915 was submitted by Karel, the administrator of WhereOnGoogleEarth prior to Paul and Andrew taking over.
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. In September 2023, it received the status of UNESCO World Heritage Site. It is the oldest working orrery in the world.
The orrery was built from 1774 to 1781 by Eise Eisinga, a wool carder and amateur astronomer. Eise Eisinga’s mechanical planetarium is built into the timber roof of the living room ceiling of his historic canal house. William I, Prince of Orange and the first King of the Netherlands, was so impressed with the planetarium, he purchased the house and it became a royal planetarium. The museum consists of the planetarium room, a screening room where documentaries are shown, and special exhibits based on modern astronomy. Other parts on permanent display are Eisinga’s former wool combing establishments and a collection of historical astronomical instruments. Those instruments in the collection include Georgian telescopes, 18th century octants and a tellurium, an educational model of the Sun, Earth and Moon.
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 planetarium is very exact, but is not perfect. The pendulum, for instance, is made of a single type of metal so it is influenced by temperature fluctuations. 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.
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).
Found before the hint:
- Martin de Bock
- Graham Hedley
- hhgygy
- Paul Voestermans
- krenek
- Eloy Cano
- Garfield
- Lighthouse
- Philip Ower
- Bas van Limpt
- Angie CF
After the hint:
Correctly identified Karel as the submitter:
- Martin de Bock
- Paul Voestermans
- Eloy Canó
- Lighthouse
- Philip Ower
