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Thanks Ken. The inner diameter of the large “inner gear” is 1.28 meters. This dictates what all the other measurements are.

@@Orrery-collection How ya goin Roy I hope you,re well. Really loved the work that you did on the Tellurian Orrery and very well done. I reckon I,m going to build one and was wondering the dimensions. Thanks a lot for responding I really appreciate it an thankyou.

Thank you!

That’s right. 18mm birch ply

Thank you

Sorry I have no plans

I have published a more recent video “Orrery/Tellurion (inner gear) construction “ which shows most of the construction details. I haven’t got detailed plans though but the video is quite thorough Thanks for your comments

Hi Ravindra I’m sorry haven’t replied before I don’t know how I missed your kind message. I have just seen your video. it’s very good and runs so smoothly and if I helped in any way I’m very pleased.

Thanks for comment

Thanks for the positive comments. I hope to post another video in the summer.

I haven’t got any plans l just drew it out straight onto birch ply and then with a lot of trial and error it evolved into this. However I have made a construction video on another of my orreries which shares a lot of the same features as this one. The RUclips video is titled ‘’Orrery/Tellurion (inner gear) construction”. I hope you find it useful. Thanks for your comments.

@@Orrery-collection Thank You - for the info. I have a CNC router, and would love to build a scaled version.

Thanks. I have no objections to you copying my design and would be very interested to see your results. The dish has sloping edges which means the circumference is greater at the top than the bottom. The Earth’s rotation can be adjusted by changing where the cog at the end of the Earth’s axis contacts the dish. The dish diameter is about 155mm at the top giving a circumference of 487mm. The nylon cog has a diameter of approximately 5.3mm giving it a circumference of about 16mm. This rotates the Earth in theory 30 times per lunar cycle. However we must remember that this is made out of wood so getting an accurate rotation for the Earth by this method is not possible in practice. On my model when I have counted the Earth rotations (not easy) it can vary between 25 to 30 rotations per lunar cycle. You could introduce a brass gear ring instead of my “dish” which could give greater accuracy. Good Luck

I’ve had requests for plans before and this in part is why I produced this construction video in the hope it would answer most questions on how it’s made. l haven’t got any plans, it evolved through trial and error and to produce detailed plans now would be quite a big job. Sorry there are no plans but thanks again for your interest and comments

It’s always good to receive appreciative comments. Thanks very much

I’m sorry but it is not for sale

@@Orrery-collection ok thanks for the reply.....Great work though..checked your all other videos in this channel.... I roamed around internet to buy an orrery for my sun... Either it is too expensive or not accurate......thanks again.

99 teeth on the large gear and 8 on the gear that drives the moon. This gives 12.375 lunar cycles per year on this model. The number of lunar cycles per year in reality is approximately 12.36 so this model is fairly accurate in that regard. You might be interested in my video “Orrery/Tellurion (inner gear) construction “ as there is a commentary which gives some construction details.

Sticky tape round the axis (a bicycle spoke) and then earth is pushed on with a friction fit.

@@Orrery-collection thank you

The gear that forms the base has no relevance. It was an old gear that I stored badly and it became warped and therefore useless. Rather the throw it away l used it as a base for this Tellurion.

Hi Veronica, Thanks for your comments. Please go ahead and post your Tellurion video. I look forward to seeing it and would appreciate any credit you wish to give me. Have you seen my video” Orrery/Tellurion (inner gear) construction “ which maybe of interest as it shows lots of construction details. Please advise when you post your video and give title because as I said I look forward to seeing it. Good luck Roy

@@Orrery-collection Here is the link to the video ruclips.net/video/zXLgPDK5_Xo/видео.html As you can see it has many details. Anyway I think it is good for a first time! And also I don´t have the resources and tools that realy needs a proyect like this one. Thank you again!

Hi Veronica Very good model. All the features of a Tellurion are there including the earth spinning at at an axial tilt (the most difficult to achieve to my mind). Very good job. I have subscribed to your channel and hope to see more videos in the future.

@@veronicaelizabethbannert1701 I am also interested of making one model of school students, and for our astronomical community. Unfortunately, I your video is private, and I would like to get more details from your model. I will be thankful if you share your model.

Hi Vusikhaya 1. Yes my illuminated sun fits on this model and works exactly the same. 1a. As with all Orreries and Tellurions the distance between the earth and moon is not to scale and they are much too close. With this hugely reduced distance the eclipse shadow is corresponding much too big on the Earth. So with this model it has to be an eclipse every year. 2. I’ve been asked for plans before which is why I produced the “construction “ video.Unfortunately I haven’t got any plans, it evolved by trial and error but hopefully the video shows enough detail to see how it’s made. Thanks for your interest Roy

@@Orrery-collection i was hoping for something like a specsheet for each of the gears, and a step by step of how to assemble the whole thing

Sorry no plans

Hi Daryl, thanks for your comment. The electric motor (12v) driving the system is at the opposite end of the rotating arm to the earth/moon assembly. It drives the wooden gear that engages with the inner ring and this drives the rotating arm. The rotating arm then drives the earth/moon at the other end. I hope this explains.

Roy Wilson makes perfect sense...thanks for the reply!

Hi Julia Unfortunately I don’t have any plans. I solved the problems as I progressed (making many mistakes along the way) and it slowly evolved. I have been asked for plans previously and I said I would post a RUclips video showing the construction. I have now done this under the title “Orrery/Tellurion (inner gear) construction “. If you view this video I hope you will find it self explanatory. Thanks for the interest Roy

Thanks Robert. Unfortunately I don’t have any plans. I solved problems as I progressed (making quite a few mistakes along the way) and it slowly evolved I have been asked for plans previously and said I would post a video showing the construction. I have now done this under title “Orrery/Tellurion (inner gear) construction “. It is not the same Orrery but it is very similar Sorry no plans but construction video might be helpful

Hello Neftali. Thank you for your comments. I haven’t got any detailed plans, I just drew it out onto the birch ply. There was a lot of trial and error and it kind of evolved into its present state. I made this video as I had quite a few requests for plans and I hoped that this construction video would explain the basics of how I made it. The main dimensions are that the inner gear diameter is 124cms and has 99 teeth. The gear driving the moon ring has 8 teeth. This 99/8 ratio gives 12.375 lunar cycles per year on my model (The actual number of lunar cycles per year is about 12.368 ). I hope this is helpful. Roy

Hi Andre. Thanks for your comments. It is possible to make Tellurion clocks and if you google that you will see examples of some very intricate examples . It would be possible in theory for me to change the motor on mine so the main drive gear runs in real time (ie one orbit of the sun in one year) but it would not be practical for a model like mine. Mine is made mainly from 18mm birch ply. The inner gear diameter is 124cms and has 99 teeth. The gear driving the moon ring has 8 teeth. This 99/8 ratio gives 12.375 lunar cycles per year on my model. The actual number of lunar cycles per year is 12.368272 so my model runs about 5 hours “fast” after one year. I haven’t got any actual plans for mine, I just drew it out onto the ply. I hope though that my video shows enough detail to explain its workings.

Hi Eduardo, Thanks for that. It’s always good to hear positive comments. I’m glad you’ve found it helpful.

Hi The earths spin is driven by the small nylon gear at the end of the earths axis making contact by gravity with the inside of the revolving “dish” that carries the moon. I suggest you watch the video again at approx 3mins 20 sec into the video where I think it can be seen fairly clearly. Roy

Please see my video : Orrery/Tellurion (inner gear) construction. The only difference between this one and the one you saw is the main large gear but everything else is the same. I hope this helps.

Thanks for the comment. I haven't got plans as such, I just drew it all out direct onto the birch ply. There was a lot of trial and error and it eventually evolved into it's present state and it's still evolving. It all comes apart easily and I will try and post a video showing all the pieces and it being put together which will explain it's construction. Thanks again Roy Wilson

Jim Hendrickson Thanks Jim. Unfortunately I'm separated by the Atlantic, I live in England. It's a pity because Stellafane sounds like a place I would enjoy. A few years back I built a Spectrohelioscope to view the sun. I had to dismantle it though as it took up all of the garage and half of the garden. Thanks again for your comments.