When did the International Astronomical Union establish the standard list of 88 constellations?

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Astronomical map Star trails over banksia trees, in Gippsland, Vic., Austl. The south celestial pole, located in the constellation Octans, is at the centre of the trails.

The International Astronomical Union (IAU) officially decided on the list of 88 constellations during its first General Assembly in 1922.12

While the list was established in 1922, the process of defining the specific boundaries for these constellations continued over the following years. Belgian astronomer Eugène Delporte proposed boundaries that followed lines of right ascension and declination at the 1925 General Assembly, and these final boundaries were approved in 1928 and published in 1930. Consequently, while the list itself dates to 1922, the definitive standard for the 88 constellations as areas of the sky was finalized in 1930.13