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Materials: Baltic Birch Plywood, Paper, 4mm dowels, small piece of sandpaper
A beautiful wooden model kit that assembles into a an orrery that models the rotation of the Earth and Moon.
A hand crank allows you to see how the Moon phases changes over the year (it can be calibrated for any year). Accurate simulation of the season due to the tilt of the Earth can also be observed.
See the orrery in action here:
The kit contains all the parts and a full color instruction booklet. The kit comes in a box that is 15 x 18 x 1,5 cm (6 x 7 x 0.6 inches).
When done you will have an orrery that is approximately 16 x 19 x 11 cm (6.2 x 7.4 x 4.3 inches).
This is an awesome model that will not only provide joy during construction but will also teach a variety of principles. Included are explanations of celestial mechanics, the different ways of calculating the time the Moon rotates around the Earth and when the seasons change and why. A full explanation is provides on all the gear ratios used in the orrery is also provided.
A uniquely novel and educational model!
FREE GLOBAL SHIPPING on this item.
A video with some instructions to make assembly easier is available here: https://youtu.be/ZMf3HDyvf7A
The skill required to build this model is advanced.
A candle and glue is required for assembly. Full instructions can be downloaded here:
It is important to note that this orrery is made from wood with some limitations in accuracy. The “slop” between the gears means that the arrow can move 3-5 days without turning the gears (tighter gears will mean the mechanism will be hard to move). This means that the resolution is not accurate on a day basis but rather that is accurate within a 5 day interval. However, if the slop is taken into account and the midpoint of the arrow is taken, each time, when the Moon phase is set/read the accuracy is 99.94% per year. I.e. the orrery will be within the correct 5 day interval for 64 years and start to deviate by one day after subsequent rotations.
A full description on the accuracy, gear ratios and some of the celestial mechanics that are simulated is explained in the building instructions.
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169 reviews5 out of 5 stars
First model that I assembled. Instructions were easy to follow. Model works well. Instructions for fine tuning. Very happy with purchase and how model turned out! Thank you!
This was really fun to build! The orrery clearly explains both axial tilt and the phases of the moon, and it's just fun to use.
I ordered the Orrery kit on 31.09.2020 for my 3 years old daughter. It was delivered from Sweden to Bulgaria in just 9 days. We started to construct the Orrery together with my daughter, so it took us some 3 weeks. It is not an easy job, you need a lot of concentration and patience. We oiled the moving parts and teeth with mechanic oil, because the lubrication with candle is just not enough for smooth operation of the Orrery. There are some things I would like to be different: - The diameter of the final product is around 15 cm. I wish it was probably at least 2 times bigger. - Would be great if the Earth could spin around its axis. - Would be even greater if you could add a light source (on batteries) in the sun, to see the effect on Earth and Moon. Cheers from Bulgaria, Dragan
Shipped fast and I absolutely love it. The detail in both the kit and instructions are amazing and really makes this fun to build. I had lost power early in the day so I had a blast putting this together and getting it working. I hope Induku designs comes up with more designs because I want to assemble more projects like this. Also the Orrery is 99.94% accurate according to the instructions but the gears are going to be tricky to get to run smoothly, if you have issues really follow the instructions, 10 min. of working the gears will show you dramatic improvement.
YES! this is such a great kit and it really works. I hope you make a larger version and I will get that one as well. Thank you.
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