All astronomy tools
Every StargazerKit tool in one place — 19 of them, free forever.
Moon Phase Calculator
Query moon phase, lunar age and illumination for any date.
Planet Position Finder
Heliocentric distance and ecliptic longitude for all 8 planets.
Constellation Visibility Checker
See which constellations dominate the night sky for your latitude and month.
Star Magnitude Calculator
Convert between apparent magnitude, absolute magnitude and luminosity.
Meteor Shower Prediction
Annual calendar of major meteor showers with peaks and ZHR.
Lunar & Solar Eclipse Forecast
Upcoming solar and lunar eclipses with visibility regions.
Planet Opposition & Conjunction Predictor
Upcoming oppositions, conjunctions and elongations of the planets.
Stargazing Weather Visibility
Live cloud cover, visibility and humidity to grade tonight's sky.
Astronomical Time Converter
Convert local time to UTC, Julian date and local sidereal time.
Latitude & Longitude Stargazing Calibrator
Best aim angle and astronomical twilight window for your location.
Telescope Magnification Calculator
Magnification, true field of view, resolution and exit pupil.
Solar Activity Checker
Latest sunspot number and F10.7 solar radio flux.
Lunar Distance Calculator
Real-time Earth–Moon distance with perigee / apogee context.
Asteroid Orbit Query
Today's Near-Earth Objects: size, distance and hazard status.
Comet Visibility Query
Currently observable comets and their expected magnitude.
Astronomy Image Compressor
Front-end JPEG compression for large starry-sky photos.
Starry Sky Color Calibrator
Adjust brightness, contrast, saturation and hue on stargazing photos.
Astronomical Unit Converter
Convert between light-years, parsecs, AU and kilometers.
Sunrise & Sunset Tracker
Compute sunrise, sunset and day length for any date and location.