December 31 zodiac sign: Capricorn
♑︎ Everyone born on December 31 is a Capricorn: from 1950 to 2050 the Sun is in Capricorn for the whole UTC day in every year. Capricorn is a cardinal earth sign ruled by Saturn.
Where the Sun is on December 31
On December 31 the Sun is at about 8°–11° Capricorn, on day 10–11 of a 29-day Capricorn season. Aquarius season begins on January 19, January 20 or January 21 (UTC), depending on the year.
Degrees are interpolated between each year's exact ingress times, so they are good to about half a degree; your exact Sun degree needs a birth time, which the birth chart calculator uses.
December 31 decan
December 31 sits on the line between the first and second decans of Capricorn, so the decan depends on the birth year and time.
Capricorn in astrological tradition
Capricorn is traditionally linked with ambition, structure, patience. Read more about Capricorn dates and season, Capricorn compatibility and the sign for every December birthday.
Dates are UTC, so a local birthday can fall on a different date; check a boundary birthday in the Sun sign calculator. These are tropical signs, not constellations. How these dates are calculated
Frequently asked questions
What zodiac sign is December 31?
December 31 is Capricorn. In every year from 1950 to 2050, the Sun is in Capricorn for the whole of that UTC date. Capricorn is a cardinal earth sign ruled by Saturn.
Is December 31 a cusp birthday?
No. The Sun never changes sign on December 31 in the 1950–2050 table. It is day 10–11 of Capricorn season; Aquarius season begins on January 19, January 20 or January 21 (UTC), depending on the year.
What decan is December 31?
December 31 sits on the line between the first and second decans of Capricorn, so the decan depends on the birth year and time.
Astrology is a symbolic and cultural tradition. The planetary positions on this site are calculated with astronomical accuracy; the interpretations describe what astrologers associate with them and are not scientifically validated predictions about personality, relationships or the future.
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