TECH Signal 493
Sun Clock introduces a location-aware 24-hour solar and lunar display
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Illustration only Photo by Ben Vaughn on Unsplash
Engineers can embed Sun Clock as a free, ad-free progressive web app to show real-time sun and moon positions for any location.
It gives developers a self-contained, privacy-preserving way to visualize solar and lunar cycles without server calls. The app runs entirely in the browser, storing settings locally, and can be used offline after installation. This reduces reliance on external services and simplifies deployment for tools that need sunrise/sunset or moon phase data.
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Sun Clock displays the sun’s position, sunrise, solar noon, sunset, golden hour, twilight, and the moon’s phase and rise/set times for the user’s current location.
It is offered as a free progressive web app under an MIT license, contains no advertising, and can be installed for offline use.
Its rotation direction follows the hemisphere (clockwise north, anticlockwise south) and can be adjusted manually; the hour hand can track the Sun when the screen is aligned to the ecliptic plane.
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