January 20 Zodiac Sign: Aquarius or Capricorn? Love Matches

January 20 is Aquarius on the dates most calendars use, but it is a boundary day: from 1950 to 2029, about 70 percent of January 20 birth hours in US Eastern time fell in Aquarius and about 30 percent in Capricorn.

Check a January 20 Aquarius against any sign

You were born on a boundary day. The exact changeover shifts by up to a day depending on the year and the time of birth, so both signs are shown.

Share of January 20 birth hours, 1950 to 2029, US Eastern time
Sign	Share	The Sun's degrees
Aquarius	70 percent	0.0 to 1.4 degrees of Aquarius
Capricorn	30 percent	29.1 to 30.0 degrees of Capricorn

The Sun's move into Aquarius landed between January 19 and January 20 (US Eastern time) in those years; the tropical year is about 365.24 days, so the moment shifts by hours from year to year and moves back after each leap day.

Check a January 20 birth by year and time

January 20 zodiac compatibility

If you are an Aquarius

By this site's zodiac points method, a January 20 Aquarius scores highest with Gemini and Libra, a strong match at 8 of 8 points, then Aries and Sagittarius, a good match at 5 of 8.

Pair	Verdict	Points	Aspect
Gemini and Aquarius	strong match	8 of 8	trine
Libra and Aquarius	strong match	8 of 8	trine
Aries and Aquarius	good match	5 of 8	sextile
Sagittarius and Aquarius	good match	5 of 8	sextile

who a January 20 Aquarius is compatible with

Today's Aquarius love horoscope

If you are a Capricorn

By this site's zodiac points method, a January 20 Capricorn scores highest with Taurus and Virgo, a strong match at 8 of 8 points, then Scorpio and Pisces, a good match at 5 of 8.

Pair	Verdict	Points	Aspect
Taurus and Capricorn	strong match	8 of 8	trine
Virgo and Capricorn	strong match	8 of 8	trine
Scorpio and Capricorn	good match	5 of 8	sextile
Capricorn and Pisces	good match	5 of 8	sextile

who a January 20 Capricorn is compatible with

Today's Capricorn love horoscope

Have your partner's birthday? Compare January 20 with your partner's birthday.

Scores come from this site's zodiac points method (formula 1.1), reviewed by Jahben R., astrologer, on 2026-09-23. How it works is on the methodology page.

Aquarius at a glance for a January 20 birthday

If you are an Aquarius

Element: air
Modality: fixed
Ruler: Uranus (traditionally Saturn)
Position: day 1 of 30 of Aquarius
Next sign: Pisces, from February 19

If you are a Capricorn

Element: earth
Modality: cardinal
Ruler: Saturn
Position: the day after Capricorn's last day on most calendars (January 19)
Next sign: Aquarius, from January 20

January 20 decan (Tradition)

In the triplicity system of decans, a tradition, January 20 falls at the end of the third decan of Capricorn (20 to 30 degrees), ruled by Mercury, or the start of the first decan of Aquarius (0 to 10 degrees), ruled by Uranus (traditionally Saturn), depending on the year and hour.

The older Chaldean system of decans assigns different rulers.

Famous people born on January 20

Federico Fellini, film director, born 1920
Buzz Aldrin, astronaut, born 1930
Nikki Haley, politician, born 1972
Patricia Neal, actor, born 1926
David Lee, physicist, born 1931

Birth dates from Wikidata (CC0), fetched 2026-09-26.

A note on January 20 birthdays

January 20 sits on the cusp between two signs, and the day leans toward Aquarius by about 70 to Capricorn's 30. In the triplicity system of decans, the Aquarius minutes of the day sit in the first decan, ruled by Uranus and, traditionally, Saturn, while the Capricorn minutes close out that sign's third decan, handed to Mercury through Virgo. By this site's points method, an Aquarius reading favors Gemini and Libra as strong trine matches, and a Capricorn reading favors Taurus and Virgo the same way, with Scorpio and Pisces a good sextile beneath them.

Questions people ask

Is January 20 an Aquarius or a Capricorn?

Either, depending on the birth. On the dates most calendars use, January 20 is Aquarius. From 1950 to 2029, about 70 percent of January 20 birth hours in US Eastern time fell in Aquarius and about 30 percent in Capricorn; the year, the hour and the time zone decide.

Is January 20 on the Aquarius and Capricorn cusp?

The Sun changes sign on or around January 20, so the day can belong to Aquarius or Capricorn. A cusp is not a thirteenth sign in Western astrology or in this site's scoring: a January 20 birth is one sign or the other.

Who is a January 20 Aquarius or Capricorn most compatible with?

By this site's zodiac points method, an Aquarius scores highest with Gemini and Libra (a strong match, 8 of 8 points), then Aries and Sagittarius (a good match, 5 of 8); a Capricorn with Taurus and Virgo (a strong match, 8 of 8 points), then Scorpio and Pisces (a good match, 5 of 8).

Does the birth year change the zodiac sign for January 20?

Yes. The Sun's move into Aquarius landed between January 19 and January 20 (US Eastern time) from 1950 to 2029, so the year, the hour and the time zone decide a January 20 sign. The calculator on the zodiac sign dates page checks one birth.

Birthdays around January 20

January 19, Capricorn or Aquarius
January 21, Aquarius
All January birthdays

Sources

astronomy-engine 2.1.19: the Sun's position; the methodology page records its check against NASA JPL Horizons, and the build checks it against published equinox and solstice times
This site's zodiac points method: formula 1.1
Wikidata (CC0): birth dates, fetched 2026-09-26