This quiz asks for all 88 constellations of the night sky. The board is one flat map of the whole sky, like the chart in a star atlas.
Each constellation is one region on the map, drawn with its official boundary. The map also shows the stars and the stick figures, so you can find Orion by his belt and the Southern Cross by its shape.
Type a constellation's name and its region lights up. The regions you have not named stay gray.
How to play
Type the name of any constellation. You do not have to press Enter — the quiz accepts the name as soon as you spell it.
Start typing anywhere; the answer bar catches it automatically.
The Latin name is the answer: Orion, Ursa Major, Crux. Famous English names also count — "Southern Cross" solves Crux, and "Big Dipper" solves Ursa Major.
Frequent misspellings count too, such as "Pheonix" and "Ophiucus".
Some names start with another full name. If you type "Leo Minor", the quiz solves Leo when you reach the third letter. Keep typing — the box clears, and the full name then solves Leo Minor.
The progress panel splits the sky into three groups: the Zodiac, the northern sky and the southern sky.
The timer starts at your first keystroke and counts up. Give Up ends the run and shows every constellation you missed. Progress saves automatically.
What counts in this quiz
All 88 constellations of the International Astronomical Union, from large Hydra to small Crux.
The 12 constellations of the Zodiac form their own group in the progress panel.
Serpens is one answer. The sky splits it into two halves around Ophiuchus, and the quiz colors both halves when you name it.
The map is an equirectangular chart of the full sky. Right ascension increases to the left, like every printed star atlas.
What's not included — and why
Asterisms are not separate answers. The Big Dipper is part of Ursa Major, so typing it solves Ursa Major.
Historical constellations are not here. Quadrans Muralis and Argo Navis left the official list — Argo's pieces live on as Carina, Puppis and Vela.
Single stars are not answers. Polaris, Sirius and Betelgeuse are stars inside constellations, not constellations.
Good to know
The 88 official constellations date only from 1922, when the IAU fixed the list and later drew every boundary.
Hydra is the largest constellation and covers more than 3% of the sky. Crux, the smallest, fits inside it 19 times.
The Sun passes through 13 constellations, not 12 — Ophiuchus is the zodiac's uninvited guest.
Every star you can see with your eyes belongs to exactly one constellation. The boundaries tile the whole sky with no gaps.
Sailors still learn Crux. It points to the south celestial pole, where no bright pole star exists.