A tabletop solar system model can now keep moving on its own after a single setup, and it does so without relying on the internet. Meridian Orrery turns a familiar maker idea into a self-contained display that uses timing and mechanical motion to track planetary positions automatically.
The project comes from illusionmanager and was published on Instructables as a DIY build meant to stay approachable for home makers. Although the finished model looks intricate, the internal design was simplified so the assembly process would remain manageable.
How the system stays accurate offline
At the core of the build is an ESP32C3 Super Mini, which handles the main computation. Timekeeping depends on a DS3231 real-time clock, allowing the model to maintain accurate timing even when it is not connected online.
Once the date and time are calibrated, the system can calculate planetary positions by itself. From that point on, it keeps updating as time passes, so the display does not become a static decoration.
Automatic motion that runs every night
The most visible behavior appears after the initial setup is complete. Each night, the rings in Meridian Orrery begin to turn until the whole structure aligns at the vernal equinox position.
After that reference point is reached, the system moves each planet to its proper location. The motion follows a back-and-forth pattern until every element lands where it should, combining timing logic with mechanical synchronization.
A build aimed at makers, not industrial labs
The parts list is relatively practical for a complex DIY project. Along with the ESP32C3 Super Mini and the DS3231 module, the build uses a motor, magnets, sandpaper, and a 3D printer for the physical components.
That approach shifts much of the difficulty into printing, assembling, and initial calibration. The concept suggests that the heavy design work has already been handled, leaving the builder to follow the planned structure.
The Moon is the standout detail
One of the most interesting additions is a small Moon that orbits Earth. This detail gives the model more motion and makes it feel closer to a real astronomical system rather than a simple planet display.
To make that happen, illusionmanager uses a compact mechanical solution. A 6-tooth gear runs inside a 66-tooth ring, creating a 1:11 ratio that brings the Moon back to the same position after one full Earth rotation.
That gear relationship matters because the Moon’s orbit must still make sense inside a very small space. With the right geometry, the model can keep the motion believable without adding major electronic complexity.
Why it stands out for the maker community
Meridian Orrery brings together familiar tools that many hobbyists already understand. ESP32 adds computing flexibility, while 3D printing makes it possible to shape the physical structure at home.
Magnets and motors provide the movement that turns the project into more than a decorative object. The result is a desktop device that combines electronics, mechanical design, and interest in astronomy in one build.
Its appeal also comes from the fact that it continues working offline after the first calibration. For a desk or living room display, that makes the model more self-sufficient and easier to keep running without a constant network connection.
Meridian Orrery presents a classic solar system model in a modern DIY format. With an ESP32C3, a DS3231 real-time clock, 3D-printed parts, a motor, and magnets, the movement of the cosmos can now sit on a table as a self-built device.
