Solar System models, especially mechanical models, called orreries, that illustrate the relative positions and motions of the planets and moons in the Solar System have been built for centuries. While they often showed relative sizes, these models were usually not built to scale. The enormous ratio of interplanetary distances to planetary diameters makes constructing a scale model of the Solar System a challenging task. As one example of the difficulty, the distance between the Earth and the Sun is almost 12,000 times the diameter of the Earth.
If the smaller planets are to be easily visible to the naked eye, large outdoor spaces are generally necessary, as is some means for highlighting objects that might otherwise not be noticed from a distance. The Boston Museum of Science had placed bronze models of the planets in major public buildings, all on similar stands with interpretive labels.[1] For example, the model of Jupiter was located in the cavernous South Station waiting area. The properly-scaled, basket-ball-sized model is 1.3 miles (2.14 km) from the model Sun which is located at the museum, graphically illustrating the immense empty space in the Solar System.
The objects in such large models do not move. Traditional orreries often did move, and some used clockworks to display the relative speeds of objects accurately. These can be thought of as being correctly scaled in time, instead of distance.
Permanent true scale models
Many towns and institutions have built outdoor scale models of the Solar System. Here is a table comparing these models with the actual system.
permanent; walkable; Includes: Proxima Centauri in Los Angeles, USA; Barnard's Star in Port Stanley, Falkland Islands; Sirius in Sydney, Australia; and Ross 154 in Christchurch, New Zealand
In Ireland, this instantly recognisable roadside spherical sculpture is well known, and is used as the model for the Sun. The website[57] maps out the planetary orbits and shows everyday objects to scale the planets (e.g. a golf ball for Mars)
Permanent installation honouring Eise Eisinga, the creator of the world famous Planetarium in Franeker, who lived in Visviet in 1700. As the original Planetarium only includes the planets up to Saturn, so does this one.
The scale of the planets is the same as the scale between them, and the planets are represented by everyday objects; the Earth is a peppercorn, Jupiter is a walnut, and Neptune is a coffee bean.
PDFs, A4 and 8½″×11″, to be printed, affixed to cards which are affixed to sticks; then to be held by children standing in a school yard. Includes major moons and asteroids.
Several sets of geocaching caches have been laid out as Solar System models.
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