Live Sky Map
A full-screen planetarium of the sky over you, right now or any night from 1700 to 2200. Tap any star, planet or deep-sky object to identify it, scrub time, match your real light pollution, find where to watch an active meteor shower, browse the Messier and Caldwell showpieces, zoom in for binocular-depth stars to magnitude 8, star-hop to a faint target with true-scale Telrad circles, and go red at the eyepiece. No app, no account, no ads.
TonightToday in the Sky
Tonight's Moon phase, the planets' places and the next eclipses and seasons, plus a ranked "what's up tonight" list of the best targets to see from your location.
IdentifyWhat Is That in the Sky?
Saw a bright light, star or planet and want to know what it was? Give the direction, height and time and it ranks the likely culprits, computed for your location, for tonight or a night last week.
MoonMoon Phase Calendar
Tonight's moon phase and a month grid of the new, quarter and full moons, with traditional full moon names.
MoonFull Moon Calendar
Every full moon of this year and next with its traditional name, exact local time, and the supermoons, blue moons and eclipses among them.
EclipsesEclipse & Saros Explorer
The next solar and lunar eclipses, the next one visible from your location with local times, and the Saros series behind them.
EclipsesEclipse Calendar
Every solar and lunar eclipse through 2028 on its own page: exact times, where each is visible, and what you will see from your coordinates.
MeteorsMeteor Showers
All 13 major showers with computed peak times, moonlight verdicts and a calculator for your best viewing window on the peak night.
MoonSupermoons & Micromoons
Every super and micro moon for three years with real distances, and the honest answer to how much bigger one looks.
SeasonsEquinoxes & Solstices
The four instants that turn the year: exact times for seven years, the equilux, and the earliest-sunset puzzle, computed for you.
PlanetsPlanet Parade Tracker
When the next planet parade is visible from your location, where to look, and how to see it, with a live countdown.
ConjunctionsPlanet Conjunctions
When two planets meet in the sky, with live dates and how close they pass: Venus and Jupiter, the great conjunction, and more.
PlanetsRetrograde Right Now
Which planets are retrograde at this moment, every station date through next year, and years of Mercury retrogrades ahead.
Solar systemLive Orrery
An interactive solar-system map: scrub time, switch the Sun- and Earth-centered views, and trace retrograde loops.
Solar systemVoyage: Fly the Solar System
Pilot a spacecraft through the real solar system at its real positions: fly to the planets, weave among Jupiter's moons and thread Saturn's rings, with an enlarged view by default and a true-scale toggle. A planetarium show you can pilot, not a measurement.
StarsThe 88 Constellations
The complete reference: an interactive whole-sky map, the full sortable table of names, meanings and brightest stars, and a finder guide for every one of the 88.
StarsStar Names
Every officially named star: the complete IAU list with each name's meaning and origin, on an interactive map of the whole sky, plus the truth about buying star names.
Deep skyThe Messier Catalog
All 110 deep-sky objects on one page: a whole-sky map, the complete sortable table with distances and best months, and an honest observing guide for every object.
A few close relatives live elsewhere on the site: every world has its own page under Sun, Moon & Planets, rise and set times are in the Sunrise, Sunset & Dark Window calculator, navigators will want the Nautical Almanac and the celestial navigation explainer, and you can put these tools on your own site with the embeddable widgets.
About these pages
Everything here runs entirely in your browser and uses a built-in astronomy engine, so the Moon phase, planet positions, rise and set times and eclipse predictions are computed live for any date and place, not looked up from a fixed table. Tap "Use my location" where offered to center everything on your own sky.
Want the underlying rhythms or the concepts behind them? Browse every astronomical cycle, the planet pages and the lessons in the Cycles section.