♑︎ ♒︎ Zodiac signs by birthday

January zodiac signs

January birthdays fall in Capricorn or Aquarius. Pick a day for its sign, the Sun’s exact degree and decan, and a short profile.

Capricorn and Aquarius

January belongs to two signs ruled, in traditional astrology, by the same planet. Capricorn holds the first two thirds of the month, and the Sun moves into Aquarius around the 20th. The exact changeover shifts by a day or so from year to year, which is why the dates near the 20th carry a computed cusp table.

The Capricorn half of January is cardinal earth in its middle and late degrees: patient, practical and quietly ambitious, first softened by the Venus decan and then sharpened by Mercury. The Aquarius half opens with fixed air in its rawest form, independent and principled, with Saturn ruling twice over before Mercury brings a quicker, more talkative tone at the very end of the month. Saturn links both halves, so a January birthday tends to carry discipline and a long view.

January birthdays, day by day
DateSun signSun’s degreeDecan
Capricorn
9°–12° Capricorn
2nd · Venus
Capricorn
10°–13° Capricorn
2nd · Venus
Capricorn
11°–14° Capricorn
2nd · Venus
Capricorn
12°–15° Capricorn
2nd · Venus
Capricorn
13°–16° Capricorn
2nd · Venus
Capricorn
14°–18° Capricorn
2nd · Venus
Capricorn
15°–19° Capricorn
2nd · Venus
Capricorn
16°–20° Capricorn
2nd · Venus
Capricorn
17°–21° Capricorn
2nd · Venus
Capricorn
18°–22° Capricorn
2nd · Venus
Capricorn
19°–23° Capricorn
3rd · Mercury
Capricorn
20°–24° Capricorn
3rd · Mercury
Capricorn
21°–25° Capricorn
3rd · Mercury
Capricorn
22°–26° Capricorn
3rd · Mercury
Capricorn
23°–27° Capricorn
3rd · Mercury
Capricorn
24°–28° Capricorn
3rd · Mercury
Capricorn
25°–29° Capricorn
3rd · Mercury
Capricorn
26°–30° Capricorn
3rd · Mercury
Capricorn or Aquarius cusp
27°–30° Capricorn
3rd · Mercury
Capricorn or Aquarius cusp
0°–2° Aquarius
1st · Saturn (modern: Uranus)
Capricorn or Aquarius cusp
0°–3° Aquarius
1st · Saturn (modern: Uranus)
Aquarius
0°–4° Aquarius
1st · Saturn (modern: Uranus)
Aquarius
1°–5° Aquarius
1st · Saturn (modern: Uranus)
Aquarius
2°–6° Aquarius
1st · Saturn (modern: Uranus)
Aquarius
3°–7° Aquarius
1st · Saturn (modern: Uranus)
Aquarius
4°–8° Aquarius
1st · Saturn (modern: Uranus)
Aquarius
5°–9° Aquarius
1st · Saturn (modern: Uranus)
Aquarius
6°–10° Aquarius
1st · Saturn (modern: Uranus)
Aquarius
7°–11° Aquarius
1st · Saturn (modern: Uranus)
Aquarius
8°–12° Aquarius
2nd · Mercury
Aquarius
9°–13° Aquarius
2nd · Mercury

Decans here follow the triplicity system: each sign’s first ten degrees belong to the sign itself, the next ten to the next sign of the same element, the last ten to the third. Each decan’s sub-ruler is that sign’s ruling planet. Calculated by Lunonis from the same ephemeris code as our charts (astronomy-engine, checked against Swiss Ephemeris): geocentric, tropical zodiac, true equinox of date. Times are UTC: add or subtract your time zone’s offset, which can move the change to the day before or after.

Your own chart

Beyond the birthday

Your birthday gives the Sun. Add the year, the time and the city to see your Moon, your Rising sign and every planet, free.

The other months