An orrery is a mechanical portrayal of the solar system which shows the relative movement of planets to the sun and each other. When you see an orrery for sale you may want to compare it to others on the market to assess its actual value. There are many factors to take into consideration and for true comparisons they should all be looked at.
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 created as scientific instruments to show the relevant movement of planets and moons as they travel through their orbits. Not all of them show the whole solar system but in the case of older models they may show the complete system as it was known at that time.
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.
Depicting the way each planet moves on its orbit and at its speed. The movement shows the progress through time of each planet and their relevant moons. They also show the different tilt of each planet on their axis and the planet rotations. As you can see the work involved in building these items is becoming quite demanding.
As the planets move around the cycle it can easily been seen that in relation to each other, the planets can move from close to very distant. They are normally clockwork and the mechanism moves everything on gears that keep the movement in the correct ratios. It clearly shows when moons and moons align to cause eclipses.
When you consider that both Jupiter and Saturn have over 60 moons each, a fully detailed version would be a very large and expensive item, so only certain features are depicted in different versions. They are usually not perfectly accurate either with orbits being in whole rotations while true orbits are not that accurate. The vast differences in sizes of the planets and their orbits also means that they are rarely built to scale..
So now when you see an orrery for sale, you will be much more aware of what you are looking at and the limits of these scientific and amazing items. You can identify what really interests you and be sure that you spend your money on the right thing. Maybe deciding that something small made of a more valuable material like silver fits your home better, unless you want something larger to fit a bigger space.
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 created as scientific instruments to show the relevant movement of planets and moons as they travel through their orbits. Not all of them show the whole solar system but in the case of older models they may show the complete system as it was known at that time.
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.
Depicting the way each planet moves on its orbit and at its speed. The movement shows the progress through time of each planet and their relevant moons. They also show the different tilt of each planet on their axis and the planet rotations. As you can see the work involved in building these items is becoming quite demanding.
As the planets move around the cycle it can easily been seen that in relation to each other, the planets can move from close to very distant. They are normally clockwork and the mechanism moves everything on gears that keep the movement in the correct ratios. It clearly shows when moons and moons align to cause eclipses.
When you consider that both Jupiter and Saturn have over 60 moons each, a fully detailed version would be a very large and expensive item, so only certain features are depicted in different versions. They are usually not perfectly accurate either with orbits being in whole rotations while true orbits are not that accurate. The vast differences in sizes of the planets and their orbits also means that they are rarely built to scale..
So now when you see an orrery for sale, you will be much more aware of what you are looking at and the limits of these scientific and amazing items. You can identify what really interests you and be sure that you spend your money on the right thing. Maybe deciding that something small made of a more valuable material like silver fits your home better, unless you want something larger to fit a bigger space.
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