An orrery is a mechanical model of the Solar System that illustrates or predicts the relative positions and motions of the planets and moons, usually according to the heliocentric model. It may also represent the relative sizes of these bodies; however, since accurate scaling is often not practical due to the actual large ratio differences, it ...

An armillary sphere (variations are known as spherical astrolabe, armilla, or armil) is a model of objects in the sky (on the celestial sphere), consisting of a spherical framework of rings, centered on Earth or the Sun, that represent lines of celestial longitude and latitude and other astronomically important features, such as the ecliptic.

This book explains how to use the terrestrial and celestial globes, an armillary sphere (which shows the movements of the sky), and an orrery (which models the motions of the planets). Martin operated an instrument shop in London.

On this orrery the sun, moon and planets revolve along a flat surface driven underneath by a hidden gearworks. Spherical bands surrounding the flat surface represent the celestial equator, the arctic circle, a movable horizon, and the ecliptic marked with the zodiacal signs.

Our orrery is a shadow orrery - two of the bodies, the Sun and the Earth, are represented by small light bulbs. Whenever the orrery is switched on, one or the other of these bulbs is lit. Five planets are represented by small solid spheres, with Saturn displaying rings. …

2023年9月8日 · Numerous astronomical machines illustrating the motion of the planets for educational purposes, created during the eighteenth and nineteenth centuries, are named Orrery. The name comes from Charles Boyle (1674–1731), fourth Earl of Orrery, who commissioned John Rowley to build the first complete machine in England.

An Orrery is a model of the Solar System, usually constructed as a clock-work mechanism that sits on a desktop. A large, outdoor “human” Orrery is located just a few hundred yards before the north entrance to Joshua Tree National Park at SKY’S THE LIMIT Observatory and Nature Center in Twentynine Palms, California.

2022年11月4日 · An orrery is a mechanical model of the Solar System that illustrates or predicts the relative positions and motions of the planets and moons, usually according to the heliocentric model.

Armillary spheres are mainly useful for explaining the apparent motions of the fixed stars, but in many examples, sun, moon or planets are represented. The word orrery was first used in England in 1713 as the name for models of the solar system.

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