
Free
Rating summary
About
Lucida answers the question you ask before you step outside: is tonight worth it, what time, and what should you look at?
TONIGHT
Combines everything that changes through the night: where you are, when the Moon rises, when the sky reaches full darkness, what the clouds will do, into a single score and your best window to go out. A seven-night outlook answers "tonight, or Saturday?" too.
CALENDAR
Moon phases, meteor showers, eclipses, and International Space Station passes, all in one timeline. For every event, Lucida tells you whether it's visible from where you are, and if so, when and where to look. ISS passes are filtered to ones you can actually see; notable events you can't see from your location are listed too.
AUTOMATIC LIGHT POLLUTION
No need to set your Bortle scale by hand; it's estimated from your location. Tonight's visible objects are filtered against that value, so things you couldn't actually see never make the list.
SKY
Turn your phone and the sky turns with you. Pan with a finger, pinch to zoom. Objects below the horizon are still shown, dimmed.
ATLAS
A visual tree from the universe down to individual moons. Tap to branch deeper, from the Milky Way to the Solar System, down to Jupiter's moons. In Concepts mode, explore ideas like supernovae, black holes, and dark matter.
WORKS OFFLINE
All astronomy calculations run on your device. The catalog, star map, and Atlas all work without an internet connection.
No account required, no ads, no personal data collected.
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What's New in Lucida
1.3.1
August 25, 2026
- Source links in the Encyclopedia now open without leaving the app, in a sheet that slides over Lucida - Added WiFi GoTo telescope control (Beta) set it up in Settings and send any selected object straight to your mount - Small visual and stability improvements
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