The term " asterism " is used for sparse groupings of stars suspected of being mere chance alignments of stars, rather than true physical systems.

The asterism Pleiades is undoubtedly the most famous galactic star cluster in the heavens, known and regarded with reverence since remote antiquity. Almost every nation has commented on their mysterious beauty. In the works of authors from many different ages and different origins, there are descriptions which partly represent the Pleiades" meaning to these ancient peoples. As well as their beauty, the Pleiades possess another valuable property - they are a useful reference point (landmark) during the year as an indicator of the passing seasons.