心宿 ('Heart Mansion') is one of the
二十八宿 (the Twenty-Eight Mansions) of traditional Chinese astronomy - the 'Heart' lunar lodging in the Eastern Azure Dragon
东方苍龙.
心宿二 is the second (
二) and brightest star in that lodging, identified with Antares. In ancient texts it's also called
大火 ('Great Fire') because of its red color.
