Mechanical Tellurion

Mechanical Tellurion
Mechanical Tellurion
Mechanical Tellurion
Mechanical Tellurion
Mechanical Tellurion
Mechanical Tellurion
Mechanical Tellurion
Mechanical Tellurion
Mechanical Tellurion

Mechanical Tellurion

Regular price C$75.90
  • In stock
  • Inventory on the way

The idea of a space-themed model has been "floating in the ether" at Ugears for some time now. Every time we announce a new model, hopeful Ugears fans will ask, "Is it an orrery?" From this shared desire a project was born. Our mission: to spread knowledge of space and time by helping people visualize the movements of the planet we live on, and its closest satellite, the moon.

Ugears is proud to present the Mechanical Tellurion, an accurate wooden model representation of our corner of the universe. A tellurion (also spelled tellurian, tellurium, and sometimes called a loxocosm), is an ingenious mechanism that depicts the cosmic dance between Sun, Earth and Moon. The causes of day and night, the phases of the moon, and the changing seasons are seen and understood according to the movements of this 3D puzzle. A tellurion (from the Latin tellus, meaning "earth") is related to the orrery, which illustrates the relative positions and motions of the planets and moons in the solar system in a heliocentric model.

What is my place in the universe? Where am I going? We can't help you with the metaphysical aspect of these questions, but this wooden puzzle will help you understand the voyages you make as a passenger on planet Earth, and your interconnected relationship with some of your nearest celestial neighbors. We all experience the regular cycles of day and night, the phases of the moon, the changing of the seasons and the passing of the years. But how many of us truly understand these phenomena, or can explain what's behind the clocks and calendars that rule our lives? Any child can tell you how old they are, but ask a child how many times they've circled the sun, and you might get a puzzled look, or an amusing range of answers: A hundred twenty-seven? Ten thousand? Once? Never?

Build the beguiling DIY wooden model Tellurion, enjoy showing it to your family and friends, and you will all have a better understanding of the heavens, the seasons, and the concept of time itself. Turn the handle to set the closely calibrated system of gears in motion. One turn of the handle = one rotation of the earth on its axis = one day. Point to a spot on Earth's surface, observe the spinning earth's position relative to the sun, and visualize sunrise and sunset, the passage of day into night. The Tellurion shows the phases of the moon are a function of the moon's position relative to the sun and earth. When rotating, the moon rises and falls slightly, thereby changing its trajectory. The earth's orbit around the sun, together with a correct depiction of the 23.5 degree inclined orientation of the earth on its axis, shows why we experience changing seasons (outside the equatorial regions). The Tellurion charts the passage of the seasons, while also giving a handsome graphic representation of the zodiac, showing the sign and constellation under which you were born.

The Ugears Mechanical Tellurion can be manually adjusted or "tuned" to provide an accurate depiction of the relative positions of the sun, earth and moon on any given day. When "tuning" the mechanism, set the pointer to the middle of winter or summer on the seasons dial. The earth, on its tilted axis, can be rotated (using a gear under the phases of the moon) to have either hemisphere be farthest from the sun in the bleak midwinter, or closest to the sun in summer. Turn the handle the correct number of days forward or back, from whichever solstice is closest in time, to set the present day. After consulting a lunar calendar, use the upper gear disk to adjust the position of the moon to its correct phase. Your Tellurion is now "set." With each passing day, give the model one turn of the crank to chart the earth's progress around the sun, and the moon's lunar cycle as it orbits the earth.

As you study the movements of your Ugears model Tellurion, you will learn that the full moon occurs when the moon is behind the earth, away from the sun. This is because the sun illuminates the entire surface of the moon that is visible to us (the "bright side" of the moon). In contrast, when the moon is between the earth and the sun, the sun's rays illuminate that part of the moon that is turned away from us (the "dark side" of the moon). We call this phase the "new moon," the period when the moon is not visible in the night sky. In the intervals between these phases, the moon waxes and wanes, changing its apparent shape, depending on how much of the illuminated part we can observe from the earth. The phases of the moon are just one of many somewhat counterintuitive astronomic understandings that are easy to visualize with the Ugears Tellurion 3D puzzle.

At Ugears, a rough approximation or "close enough," isn't really our style. In representing the orbital periods of our planet and the moon, our design engineers have given the Mechanical Tellurion a sophisticated gear system (first worked out by Dutch mathematician Christiaan Huygens in the 17th C) to have the most accurate approximations possible in a wooden mechanism at this scale. The earth gearing has a 365.256 day orbital period, while the moon-earth gear system has an orbital period of 27.323, giving accuracies within one thousandth of a day.

The Ugears Mechanical Tellurion DIY model kit comes with 249 parts and is rated "Medium," with an estimated construction time of 5 hours. This 3D representation of the earth's movements and its interplay with nearby celestial bodies will appeal to anyone interested in space, astronomy, skywatching, or to those wanting to understand, or teach a child, the basic natural phenomena that rule our lives: day/night, the seasons, the lunar cycle, and the construct of time. The Tellurion is a great DIY project or gift idea for any hobbyist or budding astronomer. We are pleased to finally bring this beautiful tellurion/orrery 3D model to Ugears fans all around the world—the world we spin on together.

Model size: 15.9*10.2*12 in (40.5*26*30.5 cm)
Package size:  14.9*6.7*1.3 in (37.8*17*3.4 cm)
Number of components: 249
Estimated time for assembly: 5 hours



Currently we don't provide delivery outside of Canada.

Orders over CA$49.90 qualify for free domestic shipping. A shipping rate of CA$9.90 applies to orders under CA$49.89. Priority Shipping is CA$19.50.

There is one business day processing, so generally the delivery will take between 2 and 5 business days with standard shipping and 1-3 business days with priority shipping, depending on your location. Orders are not shipped or delivered on weekends. If there will be a significant delay in shipment of your order, we will contact you via email or telephone.

Please double check your billing and shipping address when placing an order as we are unable to reroute packages.

After you have placed an order, you have 30 minutes to cancel it if you change your mind or make a mistake.  

Pick Up

Unfortunately this option is unavailable at the moment.  


Items listed as pre- or back-ordered are still available for purchase and we will send them over to you as soon as we’re stocked up. We will stay in touch to keep you


At Remarkable Gifts LLC (UGEARS Canada), we stand behind each and every one of our models and ensure your purchase with our 30-days guarantee return policy. If you are not completely satisfied with your item, simply return it for a full return/refund.

Items can be returned within 30 days after the date of a purchase either for a full refund of an original purchase of an item or an exchange for a product of an equal value.

Items returned after 30 days from the date of an original receipt are not eligible for a refund/ exchange.

Shipping and handling costs are not included in the refund amounts.

Only the unused items in the original unopened package are eligible for return.

All returns must include the original receipt or a proof of purchase.



Please, package your return purchased item along with all original accompanying materials that were shipped with the item into a securely sealed shipping box. Mail all return items along with receipts/proof of purchase to:

Remarkable Gifts LLC, 3100 Caravelle Dr, Mississauga, Ontario, L4V 1K9 Canada.



We will inspect your returned item and make a decision about return/refund eligibility within 2-4 business days.

Once an item is accepted for return, Remarkable Gifts LLC will issue a full refund, exchange, or credit within 10-20 business days.

Once an order return processing started, it can be cancelled within 1 business day from the date of initial processing. After that time, an order can not be cancelled. However, it still may be returned within a 30-day return period for refund, credit, or exchange.

Please, keep in mind that Remarkable Gifts LLC is not responsible for the loss/damage of shipped items during the return process.

In case you receive a damaged or a wrong product, we cover the return shipping fees.

At Remarkable Gifts LLC we are constantly reinventing and reimagining our models. If you have feedback you would like to share with us, please contact us and share your thoughts! We appreciate your suggestions and are grateful for feedback. Your opinion matters when we are reviewing our existing models and are in a process of developing new ones.



We will notify you when we receive your returned item. Please allow 2-4 business days as we inspect returned an item and make a decision whether or not an item is eligible for a full refund/replacement.

Upon approval you refund will be issued and reimbursed to the original method of payment. Refunds and exchanges do not include packaging or shipping costs.



If your refund has not been issued within the indicated number of days, please check your payment account. If the refund has not been applied to your payment account contact your bank as it may take additional time for your refund to reflect on your account. There is often a processing delay before refunds are posted.

If you are still not able to locate your refund after completing the steps above, please contact us at



Only regular priced items are eligible for replacement/refund.



The only items eligible for replacement/refund are the ones that were received defective or damaged.

If you need to exchange a defective/damaged item, contact us via the e-mail:

We review your claim and notify you whether or not your item is eligible for replacement. You then should mail your item back to us along with an original receipt/proof of purchase to:

Remarkable Gifts LLC, 3100 Caravelle Dr, Mississauga, Ontario, L4V 1K9 Canada.




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Mechanical Tellurion

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