Tools · Open source

AstroClock

Holger Schoening

Astronomically correct 24-hour clock: the Sun is the hand, the star sky turns

Download

Opens the official F-Droid page

AstroClock screenshot 1AstroClock screenshot 2AstroClock screenshot 3

About AstroClock

AstroClock is an astronomically correct 24-hour clock.

Instead of an ordinary dial, it shows the sky exactly as it currently stands above your location: the Sun travels around the dial once per day as the hour hand, and the entire starry sky turns along with it – just as it really does overhead.

Features:

* The Sun as the hour hand of a true 24-hour clock

* The co-rotating starry sky with constellations for your location

* Realistic Moon phase and the visible planets

* Compass / azimuth scale along the horizon

* Sunrise, sunset, moonrise and moonset as markers

* Location set by place name or coordinates

* Usable as a live wallpaper

* Home screen widget in a clear compact layout

Privacy:

AstroClock collects no data and contains no ads and no trackers. The app requests no location permission – you enter the location yourself. The only external connection happens when you search for a place by name; the search term is then sent to the free OpenStreetMap Nominatim service to turn it into coordinates. If you enter coordinates directly, no network access takes place at all.

What's new in 1.0

First release of AstroClock.

How to install AstroClock

  1. Tap Download — the app's official page on F-Droid opens.
  2. Install it with the F-Droid app (recommended, for automatic updates), or use the download button on that page.
  3. If Android asks, allow the F-Droid app or your browser to install apps, then tap Install.
  4. Open AstroClock from your app drawer.

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