Geocentric Orrery
7 hours ago
- #Celestial Navigation
- #Geocentric Orrery
- #Traditional Wayfinding
- Trammell H designed a geocentric orrery with Earth at the center to easily identify planets in the sky, featuring daily Sun rotation and Moon lag of 12.19°.
- The model is mostly 3D printed using FreeCad, with sources on GitHub, and includes a timelapse on Mastodon showcasing its alignment with actual azimuths.
- He is preparing a writeup on epicyclic gear math and integer gear teeth combinations to achieve accurate synodic period ratios, minimizing error except for Jupiter requiring occasional adjustments.