Earth Tide vs Physics Playground App

Right now, the ground beneath your feet is rising and falling by tens of centimeters — and you can't feel a thing. Twice a day, gravity from the Moon and Sun stretches the entire solid Earth into a slow, planet-sized bulge. Earth Tide makes that invisible motion visible, in real time, anywhere on the planet. WHAT YOU CAN DO • Tide Chart — Watch vertical ground displacement in millimeters. Pan, zoom, and scrub through time to pinpoint exact peaks and troughs over hours, days, or weeks. • Tidal Compass — A live overlay shows where the Moon and Sun are pulling the ground right now. Switch to AR mode and point your camera at the sky to see the forces around you. • 3D Globe — Spin a rotatable, color-coded Earth and watch the tidal bulge sweep across continents and coastlines. • Anywhere on Earth — Use your current location or search any place in the world. SERIOUS SCIENCE, MADE SIMPLE Earth Tide is powered by the modern Yang et al. (2024) rotational-ellipsoid model, with published accuracy several times higher than the legacy method most tools rely on. The Moon does roughly 70% of the work; the Sun the other 30%. Whether you're a student, scientist, surveyor, or simply curious, you're seeing real geophysics.

Physics Playground turns science into games you play with your hands. Fire a cannon, slide pucks across the ice, fold a protein, crack a cipher, bend starlight around a black hole and forge a star. Every game runs on real physics, chemistry, biology, math or computer science, so you learn by doing, not by reading. 63 GAMES, FIVE SUBJECTS From projectiles, orbits and lasers to entanglement and the Big Bang; atoms, reactions and batteries; cells, genes and the immune system; fractions, fractals and calculus; logic gates, sorting, networks and machine learning. Each game has its own controls and its own goal. PLAY AT YOUR LEVEL Pick Curious Kid, Teen, Undergrad or PhD. Games start on Easy, Normal or Hard to match, and PhD turns off the hints for numbers only play. Free Play lets you experiment with no clock. EARN EVERY STAR Clear stages, earn up to three stars, beat your best score and collect badges. Light up your constellation and unlock the Universe Tuner when you master them all. BUILT FOR IPHONE DUO Fold it into a tabletop and the hinge aims the cannon. Open it like a book and the game spreads across both halves, with controls on their own side. Close it and keep playing on the outer screen. NEW GRAPHICS, SMOOTH AT 120 HZ Glowing particles, warped spacetime, lensed starlight and live fractals, with haptics tuned to every bounce and blast. GO DEEPER Every game links trusted sources: textbooks, papers, lectures and courses. Works on iPhone, iPad, Mac and Apple Vision Pro. Ask Siri to open a game. No account, no ads, no tracking.