Never Miss a Flawless Night Sky or Rare Transit
Automated personal stargazing intelligence. Register your observing sites, tune your exact cloud and wind limits, and get notified when pristine dark skies or ISS solar/lunar transits align.
Precision Tools Without the Clutter
Stop refreshing ten different weather apps. Astronotify automates the calculations and watches the skies for you.
ISS Solar & Lunar Transits
High-precision SGP4 orbital propagation computes when the ISS crosses the disc of the Sun or Moon from your exact GPS coordinates with 2-second chord density.
Granular Weather Filters
Define exact tolerances for cloud cover percentage, maximum wind speeds in km/h, and minimum continuous clear sky hours before a night qualifies.
Moon Phase & Dark Sky Tracking
Calculates exact lunar illumination fractions. Highlights when skies are moon-free for deep-sky imaging, or bright for high-power lunar crater study.
Bortle Scale Light Pollution
Records Bortle ratings from Class 1 (pristine dark sky) to Class 9 (inner-city skyglow) for each site, with direct links to geographical light pollution maps.
Intelligent Zero-Spam Alerts
Automated deduplication prevents repeated emails when forecasts fluctuate. Transits with ≥ 90% cloud cover are automatically silenced until weather clears.
Elevation & Multi-Site Precision
Track your backyard, club observatory, and remote dark-sky trip sites independently. Elevation support accounts for critical parallax offsets during satellite passes.
How Astronotify Works
Add Your Locations
Enter your exact GPS latitude, longitude, and elevation. Save your home garden, favorite hilltop, or holiday dark-sky spot.
Set Your Tolerances
Specify how much cloud or wind your equipment tolerates, the minimum clear hours you need, and toggle ISS transit predictions on or off.
Get Actionable Alerts
Our engine calculates orbits and analyzes daily forecasts. When conditions match your criteria, you get a clean summary email so you can set up your telescope.
Built for Stargazers, Not Data Brokers
Observing the cosmos shouldn't require surrendering your personal privacy. We believe in minimal data collection, zero ad tracking, and absolute user sovereignty.
Zero Tracking & No Harvesting
No advertising pixels, no third-party cookies, no fingerprinting scripts. We never track your activity across the web or sell your data.
Purpose-Bound & No Spam
Your data is used strictly for weather queries and orbital math. No marketing spam, no sponsor pitches—only your requested alerts and rare critical service updates.
Full Control & Total Erasure
Delete your account at any moment. All saved locations, coordinates, and predictions are permanently purged from our database immediately.
Join Stargazers on Discord
Share transit astrophotography, suggest new dark-sky parks, vote on upcoming features, and get support directly from our community.
⚠️ Note: Please choose a role upon joining the server to unlock channels.
Ready to Catch the Next Clear Sky?
Sign up in 30 seconds. No credit card required. Free and open source for stargazers everywhere.