Star Chart

The universe in your pocket: over 20 million stars, every planet and its moons, all exactly where they really are.

Used by over 40 million people worldwide, Star Chart turns your Android device into a window onto the whole visible universe — just point it at the sky and the stars introduce themselves.

✦ Pinpoint Accuracy
Star Chart doesn't approximate the sky, it calculates it. The Sun, Moon, planets, moons and comets are positioned with the same mathematical models professional astronomers use, and checked against NASA JPL's own data: comets stay within a hair's breadth of their true positions from 1900 to 2100, and Jupiter's moons cross its face exactly when NASA says they will. Shift time to 8 April 2024 and watch the Moon slide across the Sun in a total solar eclipse, right on schedule.

✦ Explore in 3D
Leave the ground behind and fly out through the solar system. Explore the rings of Saturn, the volcanoes of Mars and Jupiter's Great Red Spot, all beautifully rendered. Light and shadow are real: in a solar eclipse the Moon casts its shadow onto the Earth, even dimming the glow of its atmosphere, while Jupiter's moons trail their shadows across its clouds. And Earth's oceans catch the glint of the Sun.

✦ Sponsor a Star
If Star Chart brings you joy, you can support it by sponsoring a real star or deep-sky object and making it your own, complete with a dedication. A small act of cosmic ownership that keeps the app growing for everyone, and sponsorship unlocks every feature in Star Chart.


What you'll find up there:
• Point your device at the sky and Star Chart tells you exactly what you're looking at — in real time, using GPS and a precise 3D model of the universe
• Over 20 million stars accurately mapped across both hemispheres
• All 88 constellations, illustrated with the timeless artwork of 17th-century astronomer Johannes Hevelius
• Every planet in the solar system, their moons and the Sun - with highly precise orbits for planets, moons, asteroids and comets
• The complete Messier catalogue of 110 deep sky objects, with The Crab Nebula, Orion's Great Nebula and our closest galaxy in Andromeda beautifully rendered in volumetric 3D.
• Guided Tours — let Star Chart take you on a journey through the night sky, walk on the moon or visit the ISS
• Time Shift: travel up to 10,000 years into the past or future and watch the sky change
• Sky event notifications for moon phases, equinoxes and solstices, eclipses, conjunctions, oppositions, meteor showers and On This Day — choose exactly which ones you receive
• Tap anything to learn more — distance, brightness, mythology and more
• Browse the sky by category, order by name, size or distance, every single star fully searchable
• View below the horizon, set any location on Earth, at any time

Enhance your Star Chart experience with optional upgrades:
• Comets, with orbits kept up to date from JPL data
• Meteor showers
• ~12,000 NGC and IC deep-sky catalogues, beyond the Messier objects
• Satellites tracked live, with orbit lines around Earth
Upgrades are available individually or bundled all together at a discount.

Whether you're a curious child pointing a phone up at the dark, a lifelong amateur with a telescope and a notebook, or a professional who knows exactly where Jupiter should be — Star Chart is your companion under the stars.

We've been building Star Chart since 2009 and we're not done yet. Send us your thoughts: [email protected]

AR mode requires a device with a built-in compass. Manual scrolling supported on all devices. No internet connection required for normal use; faint stars, comet and satellite data update when you're online.