DifCal vs Solar Orrery

Calculate diffraction angles for a particular crystal with a defined orientation matrix. New crystals can be added to the database. Energy/wavelength can be changed. Currently knows about 4-circle, Z-Axis and Theta-Theta diffractometers as well as 2-circle, powder and amorphous diffraction modes. Current crystals include silicon, diamond, GaAs, Muscovite (mica), graphite, many 3-5 and 2-6 crystals. There are separate screens for setting the crystal (or creating a new one), defining the orientation matrix, defining the diffractometer mode, and calculating either angles, given h,k,l, or hkl given a set of angles. With the larger screen of the iPad all the controls are visible on a single page.

Orrery is an interactive, real-time model of the solar system and the nearby sky, built for curiosity and wonder. Start with a cinematic opening from deep space to Earth, then move freely through planets, moons, constellations, and live orbital data. Features: - Cinematic opening tour from deep space to Earth - Interactive planets, dwarf planets, moons, asteroids, comets, and spacecraft - 41,000+ stars and 88 constellation line patterns - Time controls from real time to accelerated simulation - Touch-first camera: orbit, zoom, and focus, then drill into a planet's moons - An ambient tour that drifts through the system on its own - Colorblind-accessible themes - Live feeds for near-Earth objects, solar wind, and satellite positions Built for learners, stargazers, educators, and anyone who wants to feel the scale and motion of the solar system. Questions or feedback: luke@lukesteuber.com