UTILS

Free online tools to generate, calculate,
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Astronomy Utils

Astronomy and space science tools. Star maps, planet trackers, eclipse calendars, orbital calculators, and magnitude converters — all client-side.

Age on Other Planets

Find out how old you are on Mercury, Mars, Jupiter, and every other planet, plus the date of your next planetary birthday.

Angular Size Calculator

Calculate the apparent angular size of celestial objects based on their physical size and distance from the observer.

Apparent Magnitude Calculator

Convert between apparent and absolute magnitude, compute distance modulus, and compare stellar brightness.

Drake Equation Explorer

Explore the Drake Equation by adjusting each parameter to estimate the number of detectable civilizations in our galaxy.

Eclipse Calendar

Browse upcoming solar and lunar eclipses with dates, types, visibility regions, and magnitude details.

Escape Velocity Calculator

Calculate the escape velocity for any celestial body given its mass and radius, with presets for planets and moons.

Track the International Space Station in real time with position, altitude, speed, and next visible pass predictions.

Meteor Shower Calendar

Browse annual meteor showers with peak dates, hourly rates, radiant positions, and optimal viewing conditions.

Night Sky Darkness Calculator

Estimate sky darkness using the Bortle scale based on your location, light pollution, moon phase, and atmospheric conditions.

Orbital Period Calculator

Calculate orbital periods using Kepler's third law given the semi-major axis and central body mass.

Planet Position Viewer

View current positions of planets in the solar system with right ascension, declination, and visibility information.

Redshift Calculator

Convert between redshift, recessional velocity, and comoving distance using standard cosmological parameters.

Space Travel Time Calculator

Calculate how long light takes to travel between celestial objects, with presets for common distances in the solar system and beyond.

Star Map Viewer

Interactive star map showing constellations, bright stars, and deep sky objects for any date, time, and location.

Telescope FOV Calculator

Calculate the field of view for your telescope and eyepiece combination, with visual comparisons to common celestial objects.

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