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Astronomical Clock

Free
Education

Astronomical Sun Clock showing true local solar time, the Sun, Moon, planets and brightest stars. See sunrise, sunset, day length and seasonal rhythms at a glance. Explore past and future skies. Free, ad-free and privacy-friendly. Installs to your home screen from any modern browser — no app store, no download; its manifest declares standalone display with a 512px icon, and its service worker caches assets for offline use. Submitted by its author and measured on 2026-08-11.

Catalogued August 11, 2026 · Curated by PWA Directory team
Works Offline
Installable
Cross-Platform
Free

Not sure how to add Astronomical Clock to your home screen? Step-by-step for Chrome, Safari, Firefox and Edge — it takes about ten seconds, and there is no app store involved.

Own Astronomical Clock? Have us re-run this measurement — we open it in a real browser, cut the network, and send you what survived.

Tags
localsolarmoonplanetsbrighteststarspwainstallableoffline

How to install Astronomical Clock as a PWA

Chrome / Edge
Menu (⋮) → Add to Home screen
Safari (iOS)
Share (↑) → Add to Home Screen
Firefox
Menu (⋮) → Install

Screenshots

2 images · scroll →
Astronomical Clock screenshotAstronomical Clock screenshot

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