SolAngle: Sun & Season Tracker

SolAngle is a tool designed to help you visualize the earth's relationship with the sun in real time. By combining spherical trigonometry with a beautifully responsive interface, SolAngle calculates precise solar positioning and daylight metrics for any calendar day and geographic coordinate on Earth.

Whether you are an astronomy enthusiast, a student of physics, or simply curious about how daylight shifts across the globe throughout the year, SolAngle delivers clear, dynamic mathematical metrics instantly as you adjust your orientation.

Key Features

Dynamic Solar Math Engine: Calculates the exact Solar Declination Angle to show where the sun is positioned directly overhead at solar noon for any day of the year.

Astronomical Day Length Calculator: Computes day length hours anywhere on Earth using the sunrise equation.

Hemisphere-Aware Season Tracker: Instantly updates your current season reading based on your custom calendar day and chosen observer hemisphere.

Live Canvas Overlays: Watch your position and the sun's path dynamically shift across a continuously rotating frame-by-frame globe animation. High-contrast vector markers map precisely against standard markers like the Equator, the Tropics, and the Arctic/Antarctic circles.

Fine Controls: Hold down the time adjustment selectors to accelerate through days and months, allowing you to watch the solar lines slide north and south in real time.

100% Free, Ad-Free, and Offline

SolAngle is built as a pure, lightweight digital utility. It prioritizes user privacy and system efficiency above all else:

Completely Offline: The app operates entirely locally. It does not possess network permissions, meaning your data never leaves your device and is never transmitted to third parties or cloud servers.

Zero Special Permissions: SolAngle does not request access to your device's hardware GPS location, contacts, files, or internet state.

100% Free with No Ads: No hidden paywalls, no pop-up interruptions, and no tracking SDKs or background telemetry analytics.

Smart Persistence: Your custom coordinates are safely cached inside your device's local memory purely as a convenience feature so your setup is preserved exactly as you left it between app launches.