Tradition

June 21 Zodiac Sign

Tradition: Western astrology. A tradition, not a forecast. Astrologers read it this way; the evidence does not.

By Suraj Giri

June 21 is Cancer on the dates most calendars use, but it is a boundary day: from 1950 to 2029, about 61 percent of June 21 birth hours in US Eastern time fell in Cancer and about 39 percent in Gemini.

Check a June 21 Cancer 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 June 21 birth hours, 1950 to 2029, US Eastern time
SignShareThe Sun's degrees
Cancer61 percent0.0 to 1.3 degrees of Cancer
Gemini39 percent29.0 to 30.0 degrees of Gemini

The Sun's move into Cancer landed between June 20 and June 22 (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 June 21 birth by year and time

June 21 zodiac compatibility

If you are a Cancer

By this site's zodiac points method, a June 21 Cancer scores highest with Scorpio and Pisces, a strong match at 8 of 8 points, then Taurus and Virgo, a good match at 5 of 8.

PairVerdictPointsAspect
Cancer and Scorpiostrong match8 of 8trine
Cancer and Piscesstrong match8 of 8trine
Taurus and Cancergood match5 of 8sextile
Cancer and Virgogood match5 of 8sextile

who a June 21 Cancer is compatible with

Today's Cancer love horoscope

If you are a Gemini

By this site's zodiac points method, a June 21 Gemini scores highest with Libra and Aquarius, a strong match at 8 of 8 points, then Aries and Leo, a good match at 5 of 8.

PairVerdictPointsAspect
Gemini and Librastrong match8 of 8trine
Gemini and Aquariusstrong match8 of 8trine
Aries and Geminigood match5 of 8sextile
Gemini and Leogood match5 of 8sextile

who a June 21 Gemini is compatible with

Today's Gemini love horoscope

Have your partner's birthday? Compare June 21 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.

Cancer at a glance for a June 21 birthday

If you are a Cancer

  • Element: water
  • Modality: cardinal
  • Ruler: the Moon
  • Position: day 1 of 32 of Cancer
  • Next sign: Leo, from July 23

If you are a Gemini

  • Element: air
  • Modality: mutable
  • Ruler: Mercury
  • Position: the day after Gemini's last day on most calendars (June 20)
  • Next sign: Cancer, from June 21

June 21 decan (Tradition)

In the triplicity system of decans, a tradition, June 21 falls at the end of the third decan of Gemini (20 to 30 degrees), ruled by Uranus (traditionally Saturn), or the start of the first decan of Cancer (0 to 10 degrees), ruled by the Moon, depending on the year and hour.

The older Chaldean system of decans assigns different rulers.

Famous people born on June 21

  • Jean-Paul Sartre, philosopher, born 1905
  • Lana Del Rey, singer-songwriter, born 1985
  • Chris Pratt, actor, born 1979
  • Joko Widodo, politician, born 1961
  • Shirin Ebadi, lawyer, born 1947

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

A note on June 21 birthdays

Cancer claims 61 percent of June 21, at 0.0 to 1.3 degrees, against a last 39 percent of Gemini clinging on at 29.0 to 30.0, one day past what most calendars call Gemini's finish. Here the triplicity system of decans opens Cancer's first decan under the Moon's own rule. Astrologers connect that rulership to comfort and closeness rather than display. Scorpio and Pisces both take Cancer's top rating, a trine at 8, while this site's points method leaves Taurus and Virgo at a still respectable 5, a sextile.

Questions people ask

Is June 21 a Cancer or a Gemini?
Either, depending on the birth. On the dates most calendars use, June 21 is Cancer. From 1950 to 2029, about 61 percent of June 21 birth hours in US Eastern time fell in Cancer and about 39 percent in Gemini; the year, the hour and the time zone decide.
Is June 21 on the Cancer and Gemini cusp?
The Sun changes sign on or around June 21, so the day can belong to Cancer or Gemini. A cusp is not a thirteenth sign in Western astrology or in this site's scoring: a June 21 birth is one sign or the other.
Who is a June 21 Cancer or Gemini most compatible with?
By this site's zodiac points method, a Cancer scores highest with Scorpio and Pisces (a strong match, 8 of 8 points), then Taurus and Virgo (a good match, 5 of 8); a Gemini with Libra and Aquarius (a strong match, 8 of 8 points), then Aries and Leo (a good match, 5 of 8).
Does the birth year change the zodiac sign for June 21?
Yes. The Sun's move into Cancer landed between June 20 and June 22 (US Eastern time) from 1950 to 2029, so the year, the hour and the time zone decide a June 21 sign. The calculator on the zodiac sign dates page checks one birth.

Birthdays around June 21

Sources