SlipStick vs ORBITARIUM

A reproduction of a classic engineering tool - the slide rule. This fully functional manual calculating device was the engineer and math student's means of quickly solving multiplication, division, logarithm and trigonometry calculations until the invention and wide spread use of electronic calculators.

ORBITARIUM is a native astronomy app for iPhone and iPad that lets you explore the Solar System now through interactive 3D graphics and on-device astronomical calculations. Move through time and see planetary positions, day and night on Earth, axial-tilt seasons, and lunar phases update together in one coherent view. KEY FEATURES • The Sun, all eight planets, and the Moon in an interactive RealityKit scene • Drag, pinch, and tap to orbit, zoom, and focus on celestial bodies • Select a date, play or pause time, change speed, and move across a four-year range • Earth's day-night boundary, city lights, clouds, and atmosphere synchronized with sunlight • Northern and Southern Hemisphere seasons explained through axial tilt • Moon phase, illumination, age, and the next principal phase • Local time, solar altitude and azimuth, sunrise, and sunset for nine locations worldwide • Japanese and English localization • No account required; core features work completely offline Planet positions and astronomical events are calculated on device. Body sizes and distances are compressed or exaggerated for educational readability and are clearly identified in the app.