Birthdays

Born on January 31

Sun sign
Aquarius — every year, 1940–2030
Sun degrees
10°28′ Aquarius – 11°53′ Aquarius · noon UTC, 1940–2030
Decan
second decan of Aquarius — traditional ruler Mercury
This year
January 31, 2026: Sun 11°37′ Aquarius · Moon in Cancer at noon UTC

January closes on its most talkative date. The 31st sits in Aquarius’s second decan, the stretch the traditional count hands to Mercury — and where the sign’s first decan builds its ideas in silence, this one publishes. The pattern-hunting Aquarian mind acquires a transmitter, and the month goes out mid-sentence.

The idea, said well

An Aquarius Sun sees the system; a Mercury decan can finally make you see it too. January 31 people are the sign’s translators — the ones who turn the orbital view into a sentence that lands, the abstraction into the example that sticks. They collect people the way the first decan collects principles: widely, curiously, keeping notes. Expect a contact list that spans four industries and at least two people met on a train, all of whom would take the call.

Conversation as courtship

Love, for this date, begins audibly. The attraction is verbal before it is anything else — the person who keeps up, pushes back, and says the thing nobody else at the table would risk. Long-term, the relationship’s health can be measured by whether the two of you are still actually talking or merely scheduling. At work, January 31 shines at the joints of things: writing, teaching, product, advocacy, any role where knowing and explaining are the same job. Isolation booths need not apply.

Winning the argument, losing the room

The friction: fluency is power, and this date can wield it a beat too well — the retort that was too good to hold back, the debate won while the relationship quietly left the table. Being right out loud has a price in closeness, and the growth is noticing it early: some exchanges are invitations to connect wearing the costume of a disagreement. Take the invitation.

The Sun explains the voice; the rest of the chart explains the rooms it plays in. Moon, rising sign, houses — all of it keys off your birth time and town, and the birth chart calculator reads the full set from the moment itself.

The date, answered

What zodiac sign is January 31?

Aquarius. In every year from 1940 through 2030, the Sun is in Aquarius on January 31 — between 10°28′ Aquarius and 11°53′ Aquarius at noon universal time.

Is January 31 on the cusp?

No. Across 1940–2030 the Sun sits at least 10.5° inside Aquarius on January 31, so the sign never changes with the year.

What decan is January 31?

The second decan of Aquarius (10°–20°), whose traditional ruler is Mercury.

What degree is the Sun on January 31?

Between 10°28′ Aquarius and 11°53′ Aquarius at noon universal time, depending on the year — the calendar drifts about a quarter degree per year against the Sun and resets on leap years. Your exact degree needs your birth date, year, and time.

The date gives you the Sun. The rest takes a chart.

Moon, rising, houses, aspects — computed from your exact birth moment, on your device, free.

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