Mechanical Tellurion

The UGEARS Mechanical Tellurion is a working wooden model of the Sun, Earth and Moon. Turn the handle and its calibrated gears show why we have day and night, how the Moon goes through its phases, and how the seasons change, with the zodiac marked around the edge. Tune it to today's date and lunar phase, then give it one turn a day to follow the year.

Key features

• Functional mechanical tellurion, driven by hand
• One turn of the handle equals one rotation of the Earth, or one day
• Shows the Earth's 23.5-degree axial tilt
• Seasons dial and adjustable Moon phase
• Graphic representations of the zodiac signs

Specifications

• Drive: hand crank
• Parts: pre-laser-cut wood
• Assembly: no glue or tools needed
• Instructions: step by step, in 11 languages

Pair it with other hands-on science kits.