'Constellation' is Latin for 'set of stars' — from 'stella' (star), cousin of English 'star.'
A group of stars forming a recognized pattern, traditionally named after a mythological figure, animal, or object; any cluster or gathering of related things or people.
From Late Latin 'constellātiō' (a set of stars, a constellation, the configuration of stars at a person's birth), from 'constellātus' (studded with stars), a compound of 'con-' (together, with) + 'stella' (star), from PIE *h₂stḗr (star). PIE *h₂stḗr is one of the best-attested and most archaic words in the proto-language: it gives Greek 'astēr' / 'astron' (star), Latin 'stella' (star, with a dissimilation of the second 'r'), Sanskrit 'tāra' (star), Old English 'steorra' (star), Gothic 'staírno' (star), Persian 'sitāra' (star), and modern English 'star.' From 'astron' come 'astronomy
The word 'disaster' literally means 'bad star' (Italian dis- + astro, from Latin astrum/Greek astron) — reflecting the ancient belief that catastrophes were caused by unfavourable positions of the constellations. When we say something is 'disastrous,' we are unconsciously invoking astrology.