The zodiac sign on the cusp of the 1st house is called the Ascendantor Rising sign. This sign, determined by the precise time and place of birth, is one of the three most important factors in the chart, along with the Sun and Moon. It represents our outer personality, the characteristics people first remark on when meeting us. It also shows the mask we wear in social situations, which may or may not show our true nature. Our physical appearance often reflects the Ascendant rather than the Sun.