Ceres is the largest object in the asteroid belt between Mars and Jupiter, and the only one classed as a dwarf planet. It was found in 1801 and named for the Roman goddess of grain and harvest, whose daughter Persephone was taken to the underworld.
Astrologically Ceres is about nurture: how someone looks after other people and themselves, and what makes them feel properly looked after. Food, the body, the land and the way a person mothers, or was mothered, all sit here. The myth gives it a second theme as well: loss and return, the grief when something we cared for leaves, and the long cycle of letting go and finding each other again.
Its sign and house show where care comes most naturally and where it is most needed, and its aspects show what helps or hinders it.