What Is the New Zodiac Sign in December
The new zodiac sign in December is Ophiuchus, a constellation recognized by the International Astronomical Union since 1922 and listed in the NASA fact sheet on zodiac constellations NASA Science. Ophiuchus sits between Scorpio and Sagittarius, and the Sun passes through it from approximately November 30 to December 17, overlapping traditional sign dates Space.com.
Under the tropical zodiac most commonly used in Western astrology, December is still associated with Sagittarius and Capricorn, but the astronomical reality places the Sun in Ophiuchus for part of the month. This creates a distinction between the astronomical constellation boundaries and the symbolic astrology signs, which are based on the equinoxes and solstices rather than the actual positions of the stars Astronomy & Astrophysics.
How Ophiuchus Affects December Birth Dates
For people born between roughly November 29 and December 17, the Sun was in the Ophiuchus constellation at the time of birth, according to the IAU constellation boundaries. This shifts the traditional dates for Sagittarius and Capricorn, making Ophiuchus the de facto new zodiac sign for a segment of December births.
Astrology platforms and calendar tools have updated their date ranges to reflect the 13-sign model, with Ophiuchus placed between Scorpio and Sagittarius. The Sun spends about 19 days in Ophiuchus, which is longer than several traditional signs, and this period now overlaps the start of December for many years Britannica.
Why Ophiuchus Is Considered the 13th Zodiac Sign
Ophiuchus is considered the 13th zodiac sign because the ecliptic, the apparent path of the Sun across the sky, passes through 13 constellations, not 12. The IAU defined official constellation boundaries in 1930, and Ophiuchus is the only one of the 13 that is not part of the traditional 12-sign tropical zodiac International Astronomical Union.
The inclusion of Ophiuchus does not change the tropical zodiac used by most horoscope services, which divides the ecliptic into 12 equal 30-degree segments starting at the vernal equinox. However, in sidereal astrology and astronomical terms, Ophiuchus is a recognized constellation that affects the interpretation of planetary positions for December births American Astronomical Society.