Welcome to Engineering Commons LLC! A compendium of knowledge, research, and capability on topics of mechanics, astronomy, and horology Education Stern-Brocot Trees Learn More Equation of Time Learn More Eclipse Prediction (Simple) Learn More Eclipse Prediction (Complex) Learn More Making Bevel Gears Learn More Antikythera Mechanism Planetarium Learn More Designing Orreries Learn More Antikythera Mechanism Equation of Time Learn More Pin-Slot Anomaly Correction Learn More Lunar Months Learn More Brute Force Gear Solvers Learn More Sunrise Equation Learn More Astrolabes Learn More Updates Celestis Nova Blog Beginning the Orrery Read more → Brightness Knob Read more → Tuner Control Dialed In Read more → Eclipse Dials and Spiders Read more → Lantern Pinion Design Change Read more → Eclipse Module: Moon Ball Read more → Capabilities Machining 3D Printing Laser Cutting Woodworking Build Gallery View fullsize View fullsize View fullsize View fullsize View fullsize View fullsize View fullsize View fullsize View fullsize View fullsize View fullsize View fullsize View fullsize View fullsize View fullsize View fullsize View fullsize View fullsize View fullsize View fullsize View fullsize View fullsize View fullsize View fullsize