When You Find An Orrery For Sale
A model that shows the movement of the planets and moons in the solar system is generally called an orrery. If you should be looking for an orrery for sale there are a lot of different versions and prices can vary dramatically. There are so many different factors to consider and they should all be looked at to get a real value of each item.
Depending on the condition, what it is made of and the smoothness of the movement you may find that values vary quite a lot, but this is only half the story. Size and the amount of detail will also make a difference. There are also many versions of orreries and they begin with just the sun the earth and its moon, becoming more detailed and can include any number of other moons and planets.
These were originally made for scientific use. To be able to clearly see the movement of the planets in relation to the sun and each other and demonstrate it with a moving model. It is interesting to realise that at the time some early ones were built, not all of the planets, let alone moons we know now, were recognised or known.Therefor older orreries would not have include these anyway.
Originally they were called planetariums but that word has now become more widely used to describe the light shows in large domed rooms, which depict the night sky. Now they have many names which describe ones with certain groups of planets. So it might be worth knowing which style you prefer to help cut down your search.
The idea is that the mechanism shows the movement of moons around planets and planets around the sun. They also includes the spin of each planet and moon and the tilt of each on their axis. This makes them very complex and building them takes a lot of skill.
As it is geared for each planet to move correctly, then it also shows how the planets become quite separated at some times, while at others they are quite close. It can be clearly seen when moons cast shadows on their planets and when eclipses are to happen. They are often driven by clockwork so that you can watch the cycle unfold.
With Saturn and Jupiter having moons that number over sixty a piece, to create a full model of the whole solar system would be a very complex and large item. This means that different combinations are selected to be depicted in the various versions of orrery available. Because of the vast size of the solar system and the large differences in planet and moon sizes it is almost impossible to build a version that is in true scale. Also gears work whole rotations when planets orbits are rarely a full rotation so this is also not an accurate time related movement.
When you find an orrery for sale now, you should now be able to identify exactly what you want. Bearing in mind the limitations of these wonderful items you can decide on size, material and complexity to fit your home and your wallet. Knowing that the decision you make will be informed and the item will be more than a novelty ornament.
Depending on the condition, what it is made of and the smoothness of the movement you may find that values vary quite a lot, but this is only half the story. Size and the amount of detail will also make a difference. There are also many versions of orreries and they begin with just the sun the earth and its moon, becoming more detailed and can include any number of other moons and planets.
These were originally made for scientific use. To be able to clearly see the movement of the planets in relation to the sun and each other and demonstrate it with a moving model. It is interesting to realise that at the time some early ones were built, not all of the planets, let alone moons we know now, were recognised or known.Therefor older orreries would not have include these anyway.
Originally they were called planetariums but that word has now become more widely used to describe the light shows in large domed rooms, which depict the night sky. Now they have many names which describe ones with certain groups of planets. So it might be worth knowing which style you prefer to help cut down your search.
The idea is that the mechanism shows the movement of moons around planets and planets around the sun. They also includes the spin of each planet and moon and the tilt of each on their axis. This makes them very complex and building them takes a lot of skill.
As it is geared for each planet to move correctly, then it also shows how the planets become quite separated at some times, while at others they are quite close. It can be clearly seen when moons cast shadows on their planets and when eclipses are to happen. They are often driven by clockwork so that you can watch the cycle unfold.
With Saturn and Jupiter having moons that number over sixty a piece, to create a full model of the whole solar system would be a very complex and large item. This means that different combinations are selected to be depicted in the various versions of orrery available. Because of the vast size of the solar system and the large differences in planet and moon sizes it is almost impossible to build a version that is in true scale. Also gears work whole rotations when planets orbits are rarely a full rotation so this is also not an accurate time related movement.
When you find an orrery for sale now, you should now be able to identify exactly what you want. Bearing in mind the limitations of these wonderful items you can decide on size, material and complexity to fit your home and your wallet. Knowing that the decision you make will be informed and the item will be more than a novelty ornament.
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New Unique Article!
Title: When You Find An Orrery For Sale
Author: Jayne Rutledge
Email: nathanwebster335@live.com
Keywords: sciene, culture, technology, education, learning, recreation, personal growth
Word Count: 548
Category: Science
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