Astronotify is your automated personal stargazing assistant. We continuously monitor local weather conditions and satellite orbital trajectories so you never miss a clear night or a rare celestial alignment.
Specify your tolerances for clouds, wind speed, and night duration. Astronotify fetches forecasts daily and emails you when your exact stargazing window is met.
Uses high-precision SGP4 orbital propagation to calculate when the ISS crosses the face of the Sun or Moon. Displays interactive path visualizations and separation details.
Computes the exact lunar phase and illumination fraction. Highlights whether a dark sky window is optimal for faint deep-sky targets, or if planetary observing is preferred.
Records Bortle scale light pollution ratings from Class 1 (excellent dark skies) to Class 9 (city centers). Links directly to geographical light pollution maps.
To get the most accurate predictions, it is important to configure each location's stargazing parameters:
Astronotify is completely free, ad-free, and open to the stargazing community. Orbital mechanics calculations, satellite ephemerides, and daily meteorological predictions run on dedicated cloud servers funded out of pocket. If Astronotify has helped you plan observing nights or capture ISS transits, a voluntary donation helps keep the project going.