What defines the official boundaries of constellations recognized by the IAU today?

Answer

Fixed areas of the celestial sphere

Constellations are officially recognized groupings of stars that cover specific, fixed regions of the sky defined by the International Astronomical Union (IAU).

What defines the official boundaries of constellations recognized by the IAU today?

#Videos

The Ecliptic: Crash Course Kids #37.2 - YouTube

sunastronomyZodiaccelestialconstellationscelestial path