https://pupil.rihonegroup.com/ 2026-08-22 weekly 1.0 https://pupil.rihonegroup.com/icons/pupil-og.svg Pupil — Interactive 3D STEM Simulations and Visual Science Labs Interactive classroom simulations for astronomy, physics, and astrophysics. https://pupil.rihonegroup.com/#/demos/moon-phases 2026-08-22 weekly 0.9 https://pupil.rihonegroup.com/icons/moon-512.svg Phases of the Moon — 3D Interactive Orbit and Earth View Simulation Visual explanation connecting sunlight direction, lunar orbit position, and the phase seen from Earth. https://pupil.rihonegroup.com/#/demos/earth-seasons 2026-08-22 weekly 0.9 https://pupil.rihonegroup.com/textures/earth-blue-marble.jpg Earth's Seasons and 23.4° Axial Tilt 3D Interactive Simulation Interactive 3D model demonstrating how axial tilt creates solstices, equinoxes, and day-length variations. https://pupil.rihonegroup.com/#/demos/local-horizon 2026-08-22 weekly 0.9 https://pupil.rihonegroup.com/icons/pupil-og.svg Local Horizon and Solar Altitude Sky Simulator First-person interactive sky dome tracking sun path, noon altitude, and sunrise/sunset times by latitude.