Octal Sun Time

Octal Sun Time is an open-source Android application for viewing time according to the solar day. It is intended for people who want a clock display based on solar midnight, solar noon, sunrise, and sunset rather than a conventional clock face. The application is listed in the Productivity category, with its main use centered on clock and time reference functions. Its display represents one complete day as a single cycle from one solar midnight to the next.

The main clock view uses an hour hand that moves through this solar-day cycle. The position labeled 0, for solar midnight, appears at the bottom of the display, while the position labeled 4, for solar noon, appears at the top. The center of the display shows the current octal hour and minute as a three-digit octal number. A golden arch marks the part of the day between sunrise and sunset. Locations can be managed in the application and selected as the basis for the solar time shown.

Additional locations can be found through an online search connected to Wikidata. When this search is used, the typed search term is sent to a Wikidata server to retrieve results. This search is the only described situation in which the application uses an internet connection. For distribution on Android, MirrorNest stores the official build directly on its own storage and scans it for malware before publishing it. Its open-source license indicates that the application's source is available under an open-source licensing arrangement.