Stellarium - Star Map

Stellarium - Star Map, developed by Noctua Software, is the mobile adaptation of the open-source desktop planetarium program. Designed for astronomy enthusiasts and casual skywatchers, the app projects a 3D sky map calculated in real time based on geographic location, date, and time. It maps stars, constellations, planets, comets, deep-sky objects, and satellites such as the International Space Station.

Stellarium’s technical architecture relies on sensor integration and optical rendering. Using the smartphone’s internal compass, gyroscope, and accelerometer, the app calculates device orientation to drive its augmented-reality view. Pointing the phone toward the sky aligns the display map with visible stars and planets. The rendering engine simulates atmospheric refraction, light pollution, and solar illumination to reflect realistic viewing conditions. It also includes sky culture options, displaying constellation art and historical interpretations from various global traditions.

To assist field observations, Stellarium includes a red "Night Mode" interface that lowers display brightness to preserve dark-adapted vision. The app follows a freemium structure: the free version covers visible celestial objects down to magnitude 10, while the optional "Stellarium Plus" upgrade unlocks expanded databases (including the Gaia DR3 catalog of 1.81 billion stars and 2 million deep-sky objects) along with wireless telescope control.

Minor interface drawbacks include occasional camera jumps when zooming into dense star fields and brief brightness spikes when opening settings menus, but Stellarium remains an effective tool for mobile star observation.