A Solar Compass

A Solar Compass calculates the exact moment the sun aligns with any bearing on Earth — from your current position toward any target location on the globe.

Set your source location (via GPS or manual coordinates) and a target location. The app computes the precise local time when the sun's azimuth matches that bearing, displays a live countdown, and sends you reminders so you never miss the window.

KEY FEATURES

• Sun alignment calculator — uses real astronomical equations (Julian Day, solar declination, local sidereal time, azimuth) to find the next alignment within a 5-day look-ahead window.
• Live countdown — a real-time timer counts down to the exact alignment moment. Automatically recalculates when it reaches zero.
• GPS location — tap "Use GPS" to populate your coordinates automatically.
• Manual coordinates — enter any latitude/longitude for full control.
• Automatic timezone detection — fetches the correct UTC offset for your source location so the displayed time is always local.
• Home screen widgets — a 4×1 "Time Remaining" widget and a flexible 4×4 widget keep the countdown visible without opening the app.
• Alignment notifications — opt-in reminders at 60, 30, 10, 5, and 1 minute(s) before the alignment so you have time to step outside.
• Report wrong calculation — send feedback directly from the result screen if something looks off.
• Privacy-first — location data is stored locally on your device. Anonymous crash reporting is opt-in.

HOW IT WORKS

1. Open the app — your last-used or IP-detected location loads automatically.
2. Confirm or adjust your source and target coordinates.
3. The next alignment time and a live countdown appear instantly.
4. Allow notifications to receive reminders before the moment arrives.

PERMISSIONS USED

• Location (fine + coarse) — to detect your position via GPS for the calculation. Never sent to any server without your consent.
• Notifications — to deliver pre-alignment reminders (opt-in).
• Internet — to look up the timezone for your coordinates and to load your approximate location from IP on first launch.
• Exact alarm — to schedule precise notification delivery.

No account required. No sign-up. Works offline after the first timezone look-up.