People who are born between Dec. 19 and Dec. 23 are born on the Sagittarius-Capricorn cusp. In western astrology, it is believed that people who are born on a cusp possess the energies of both signs.
Sagittarius is the ninth sign of the zodiac, and Capricorn is the 10th. Astrologists believe that people born on the Sagittarius-Capricorn cusp utilize knowledge to understand the world and work hard to master it. They are believed to be disciplined and ambitious. They are also believed to be realistic and practical. People born on the Sagittarius-Capricorn cusp tend to try to avoid getting in situations that overwhelm them.