The Collaborative International Dictionary
Catasterism
Catasterism \Ca*tas"ter*ism\, n. [Gr. ?, fr. ? to place among the stars.] A placing among the stars; a catalogue of stars.
The catasterisms of Eratosthenes.
--Whewell.
Wiktionary
catasterism
n. (context Greek mythology English) The transformation of a hero, after death, into a star or constellation