Stellarium Web

What Stellarium Web actually is

The web edition of the Stellarium planetarium renders the sky above whatever location you give it, with constellation lines, planets, deep-sky objects and satellite passes drawn in. Time can be wound forward or back, so you can check what will be up after dinner or what stood overhead on a given night.

Why it is worth your time

Dragging the time slider through sunset and watching the stars fade in exactly as they will later is more use than any written list of viewing times.

Common questions

Is Stellarium Web free?

Yes. Stellarium Web is free and does not ask you to register or hand over an email address before you can use it.

How long does Stellarium Web take?

One quick round, then you can leave. We file it under "A minute" — tonight's real sky, from your exact spot, in a browser tab.

Does Stellarium Web work on a phone?

Yes. Stellarium Web works on a phone as well as it does on a laptop.

What kind of site is Stellarium Web?

We list it under Cosmos & Scale — zoom out until you feel small. Dragging the time slider through sunset and watching the stars fade in exactly as they will later is more use than any written list of viewing times.