LOOK UP. GO FURTHER.
A sky full of questions.
Connect the stars. Travel between worlds. Discover where we belong.
THE CELESTIAL SPHERE
Our view from Earth
Find your next discovery
Opening the star catalog…
The 3D view is unavailable.
You can still search the catalog, study every object and complete the journeys below.
Real star directions · J2000 coordinates. Connecting lines are patterns, not official constellation boundaries.
CONSTELLATION
Orion
Select a star or constellation to begin exploring.
A constellation is a direction in the sky, not a group of stars at one distance.
Choose a discovery. Every object has a story.
PUT DISTANCE IN PERSPECTIVE
Compare discoveries
DON’T JUST WATCH. WORK IT OUT.
Take a study journey.
Your progress stays on this device.
Short explanations, a place to explore, and a question to make the idea stick.
YOUR PLACE ON EARTH
Could I look that way?
Estimate the selected sky object’s altitude over your horizon.
Geometric estimate using J2000 directions; no precession, refraction or terrain. Above the horizon does not guarantee visibility: daylight, weather and light pollution matter. Solar-system positions are illustrative, so this tool excludes them.
KEEP YOUR CURIOSITY
Observation notebook
Notes save automatically in this browser. No account needed.
A FEW WORDS OPEN A UNIVERSE
The language of space.
About the atlas, its scale and sources
This is a learning atlas, not a complete inventory of the universe or a live telescope feed. The sky map contains all 88 constellations and a bright-star catalog. Other maps show a curated set of objects. Constellation lines are one visual tradition; many cultures connect the sky differently.
Star directions use J2000 coordinates. Solar orbits are circular illustrations with compressed spacing and enlarged bodies; they do not predict current planet positions. Nearby stars use distance-based positions with enlarged markers. Deep-sky objects are placed by direction; their artwork and sizes are illustrative. Distances are rounded and can change as measurements improve.
Star and constellation data: d3-celestial. IAU constellation guide. Horizon calculations: US Naval Observatory. Object and study cards link to their science sources. Data provenance and licenses.