Heliodos
- The colours for the paths can be configured in settings
- The moon (current trajectory/position) is now also supported (but disabled
by default in the settings)
- Hour ticks with time labels are shown on the current sun and moon paths
- Improved selection of cameras that can be used on some devices
Stand in your garden, on a building plot, or any outdoor space, point your camera at the sky, and instantly see the sun's arc for the summer solstice, winter solstice, equinox, and the current date and time, plus the moon's current trajectory — including any obstacles in the sun's path.
Features
- AR sun and moon trajectories: The sun's path for the solstices, the equinox, and the current moment — plus the moon's current trajectory — are drawn directly over the live camera image, with hour tick marks and time labels on the current paths.
- Customisable paths: Toggle individual paths on or off and pick custom colours for each in the settings.
- Flexible location: Uses your GPS location automatically, or lets you set any place on Earth manually.
- Custom time: Simulate the sun's position at any time of day, not just right now.
- Camera selection: Pinch to zoom to cycle through available back cameras (wide-angle, normal, telephoto).
Use cases
- Gardening: Find out which spots get full sun in summer versus winter before you plant.
- Real estate: Check how much natural light a room or terrace receives throughout the year.
- Architecture & construction: Plan shading, windows, and solar panels with real-world sun data.
- Photography: Scout locations and predict golden-hour angles in advance.
Heliodos requires camera and location permissions to function. No data is collected or transmitted.
- Author: Daniel Kraft
- License: GNU General Public License v3.0 only
- Issue Tracker
- Source Code
- Changelog
- Build Metadata
- Reproducibility Status
Versions
Although APK downloads are available below to give you the choice, you should be aware that by installing that way you will not receive update notifications and it's a less secure way to download. We recommend that you install the F-Droid client and use that.
Download F-Droid-
This version requires Android 11 or newer.
It is built and signed by the original developer, and guaranteed to correspond to this source tarball.
Download APK 7.4 MiB PGP Signature | Build Log
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This version requires Android 7.0 or newer.
It is built and signed by the original developer, and guaranteed to correspond to this source tarball.
Download APK 3.3 MiB PGP Signature | Build Log
Features:
- AR overlay of the sun path and position over the camera feed
- Shows sun paths at solstices, equinoxes and the current date/time
- Location from GPS or custom set to any place on Earth
- Current time or custom set time