About StarWatchr
A personal astronomy project for finding clear skies and planning nights under the stars.
Explore StarWatchr
Forecast ↗
Weather, darkness, Sun and Moon for your location.
Observing alerts ↗
Email or device notifications when conditions suit you.
Deep sky ↗
Messier and Caldwell objects with star-hopping maps.
Solar system ↗
Planets, moons, orbits and local visibility.
Sky atlas ↗
Stars, constellations and a Solar System viewer.
Moon atlas ↗
Lunar formations, illumination and observing guides.
Planner ↗
Save observing nights, collect targets and open their finder charts.
Picture of the day ↗
NASA’s daily view of the universe.
Get in touch ↗
Questions, ideas or something that needs fixing.
How it’s built
Technology
Data & catalogues
Images & observing
Privacy
Your browser remembers your location, display preferences and alert settings. Optional alerts store your chosen location, observing preferences and email address or push subscription to deliver notifications. No background location tracking, advertising cookies or sale of data.
Optional analytics only start with your permission. They use a random browser identifier in local storage to count visits and returning browsers, recording visited page paths and visit times. Your choice is remembered for 180 days. You can change it through “Privacy settings” in the footer. Choosing “Necessary only” stops future measurement and removes the identifier from this browser; previously recorded visits are not automatically deleted. Contact us for questions about your data.
You can pause or unsubscribe at any time in alert settings.
Data & retention
Email uses our mail provider; device alerts use your browser’s push service with your permission. Your browser keeps a management key; email access can be restored with a new settings link.
Reports: 14 days. Unconfirmed emails expire after 7 days. Unsubscribed or expired subscriptions are deleted after 30 days; bounce and complaint records after 90 days.
“In the darkness, things are clearer than in the light.”