Sky Experiments
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Your sky, right now — computed in your browser, drifting as the real sky drifts.

Tonight: Saturn rises 21:14 · Moon 3 days old · ISS passes 20:52

Showing: Querétaro, MX · 20.59°N 100.39°W
Experiments

Four experiments

Free, no accounts, everything runs in your browser.

Fly Out

Hold one button and fly from Earth to the edge of the observable universe, through 250,000 real stars.

Try it Earth to the edge · WebGL2

Tonight, For Your Scope

Pick your gear, get an honest ranked list of what's actually worth observing tonight.

Try it Ranked hourly · real ephemeris

Draw the Sky

Connect the dots on a real star field, then see what five cultures drew in the same stars.

Try it 5 sky cultures

Light Lag

Pick a star, see the year its light left, and what was happening on Earth that year.

Try it 12 stars · 4.2 to 2,615 years

Who makes this

Built by one person in Querétaro, México, with a Seestar S50 — shipping small astronomy experiments in his evenings.