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Solar System model
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 objects in such models do not move. Traditional orreries often did move and some used clockworks to make the relative speeds of objects accurate. These can be thought of as being correctly scaled in time instead of distance.
==Scale models in various locations==
Several towns and institutions have built outdoor scale models of the Solar System. Here is a table comparing these models.
Several sets of geocaching (caches have been laid out as solar system models ).
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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