January 31 zodiac sign
On January 31 the Sun stands at about 11° Aquarius, in the Mercury-ruled second decan, where a quick, verbal mind meets the sign’s fixed principles.
Sun signAquarius
- Sun at 9°–13° Aquarius
- 2nd decan · Mercury
January 31 in profile
Mid-Aquarius is the sign in settled form: sociable, principled and independent. At 11° the second decan applies in most years, with Gemini and its ruler Mercury bringing speed, wit and a love of words; in a few years the Sun is still on the edge of the first decan. A January 31 Aquarius tends to process life by talking and writing. They hold firm views yet enjoy hearing others, and are quick to spot a weak link in an argument.
In conflict they fight with words, fast and precise. They can out-talk most people and sometimes use wit as a weapon. Sarcasm is their sharpest tool, and they know it. Debate suits them better than silent sulking, though they may withdraw if a quarrel turns emotional. They rarely stay angry and often forget the argument within a day, which can confuse a partner still hurt by something said.
Under stress their mind speeds up: more tabs open, more messages sent, less sleep. They may scatter attention across many tasks without finishing one. Friends notice the speed in their texts before they notice it themselves. Talking things through with a calm friend helps, as does writing a list. A daily screen-free hour, perhaps a walk or cooking a slow meal, gives the busy mind something steady to do.
Aquarius all day
In every year from 1930 to 2040 the Sun was in Aquarius for the whole of January 31, in every time zone. This is not a cusp birthday: the nearest changes of sign fall around January 21 and February 18.
Your Moon sign depends on the year
The Sun is in the same place on January 31 every year; the Moon is not. It changes sign every two and a half days, so people who share this birthday can have any of the twelve Moon signs. Here is where it was on January 31 in recent years, from 00:00 to 23:59 UTC (an arrow means it changed sign during the day).
- 2017Pisces → Aries
- 2018Leo
- 2019Sagittarius
- 2020Aries
- 2021Virgo
- 2022Capricorn → Aquarius
- 2023Gemini
- 2024Libra
- 2025Pisces
- 2026Cancer
Compatible signs for an Aquarius
Sun-sign compatibility starts from the element. Aquarius gets on most easily with its own element and with the two sextile signs, and feels the strongest pull from its opposite. For a January 31 birthday, in the Gemini decan, Gemini is a natural match. The full charts decide how a real pairing feels.
A gift for a January 31 birthday
A beautiful journal with a good pen, or a weekend writing workshop, so their fast-moving thoughts have somewhere to land.
Asked about January 31
What zodiac sign is January 31?
January 31 is Aquarius in every year: the Sun is at about 9°–13° Aquarius that day, in the sign’s 2nd decan.
Is January 31 a cusp birthday?
No. The Sun is well inside Aquarius on January 31. The cusp days, when the Sun changes sign, fall around January 21 and February 18. Astrology has no blended cusp signs anyway: at any moment the Sun is in one sign.
What decan is January 31?
January 31 falls in the 2nd decan of Aquarius. In the triplicity system we use, that decan belongs to Gemini and its ruler Mercury, which colours the Aquarius Sun with a little of Gemini. In some years the Sun crosses into the next decan during the day.
Your birthday is only the Sun
A January 31 birthday tells you where the Sun was. The Moon, the Rising sign and eight more planets each sit somewhere of their own, and they depend on the year, the hour and the place. The free calculator shows all of them.