Asterism
The Summer Triangle
A large triangle of three first-magnitude stars — Vega, Deneb, and Altair — spanning Lyra, Cygnus, and Aquila; the defining pattern of the northern summer sky.
Constellations
The constellations this pattern draws its stars from.
Stars
An asterism is a recognisable star pattern that is not one of the 88 official IAU constellations. Explore the 88 constellations →
Sources
The primary and reference sources this topic draws on.
- BritannicaEncyclopaedia Britannica
General reference for the history of astronomy, biographies, and cultural context.