Yes, December 23rd can be considered a cusp in astrology, as it falls between the zodiac signs Sagittarius and Capricorn. This day is sometimes referred to as the “cusp of ambition,” as it is a time when the energy of Sagittarius (optimism, adventure, and vision) meets the energy of Capricorn (ambition, discipline, and practicality). This combination can create a powerful drive to achieve goals and make the most of opportunities.