Sunclock is a customizable astronomical clock developed by Henning Benecke for exploring the movements of the sun and moon, seasonal changes, and diverse ways of measuring time. Designed for photographers, astronomers, travelers, and timekeeping enthusiasts, it combines practical daily information with tools for studying celestial and cultural rhythms. Users can choose from a gallery of 45 sample clocks or create their own design using flexible dial layouts, colors, fonts, hands, and photo backgrounds.

Sunclock can display sunrise and sunset, daylight length, solar noon, twilight, golden and blue hours, the sun’s altitude, moonrise and moonset, moon phases, and moonlight forecasts for selected locations and dates. It also supports solar and sidereal time, UTC, countdowns, and time elapsed since sunrise or sunset. Additional options cover temporal hours, Byzantine and other historical time systems, religious observances, Islamic prayer times, and calendar-related markers.

Available as an app, widget, and wallpaper, Sunclock also supports Android TV, Chromecast, fullscreen and screensaver modes.