Tradition

October 21 Zodiac Sign

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

By Suraj Giri

October 21 is Libra on the dates most calendars use (September 23 to October 22). From 1950 to 2029, every birth hour on October 21 in US Eastern time fell in Libra.

Check an October 21 Libra against any sign

October 21 zodiac compatibility

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

PairVerdictPointsAspect
Gemini and Librastrong match8 of 8trine
Libra and Aquariusstrong match8 of 8trine
Leo and Libragood match5 of 8sextile
Libra and Sagittariusgood match5 of 8sextile

who an October 21 Libra is compatible with

Today's Libra love horoscope

Have your partner's birthday? Compare October 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.

Libra at a glance for an October 21 birthday

  • Element: air
  • Modality: cardinal
  • Ruler: Venus
  • Position: day 29 of 30 of Libra
  • Next sign: Scorpio, from October 23
  • The Sun, 1950 to 2029 (US Eastern time): 27.0 to 29.3 degrees of Libra

October 21 decan (Tradition)

In the triplicity system of decans, a tradition, October 21 falls in the third decan of Libra (20 to 30 degrees), ruled by Mercury.

The older Chaldean system of decans assigns different rulers.

Famous people born on October 21

  • Ursula K. Le Guin, writer, born 1929
  • Carrie Fisher, actor, born 1956
  • Nemanja Vidić, footballer, born 1981
  • Nikita Mikhalkov, actor, born 1945
  • Andre Geim, physicist, born 1958

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

A note on October 21 birthdays

The Sun sits at 27.0 to 29.3 degrees of Libra on October 21, in the third decan of the sign, which the triplicity system of decans gives to Gemini and rules through Mercury. Astrologers read this stretch as talk and ideas coloring how the sign shows affection. By this site's points method, Libra scores a trine worth 8 points with both Gemini and Aquarius, and a sextile worth 5 points with Leo and Sagittarius. The tradition reads Libra as a sign that needs conversation and balance, so time spent on an easy exchange of words suits the day.

Questions people ask

What zodiac sign is October 21?
Libra. October 21 falls in Libra's dates on most calendars, September 23 to October 22, as day 29 of 30 of Libra.
Who is an October 21 Libra most compatible with?
By this site's zodiac points method, an October 21 Libra scores highest with Gemini and Aquarius (a strong match, 8 of 8 points), then Leo and Sagittarius (a good match, 5 of 8).
Does the birth year change the zodiac sign for October 21?
Not from 1950 to 2029 in US Eastern time: October 21 was Libra for every birth hour in all 80 years. For other years or time zones, use the calculator on the zodiac sign dates page.

Birthdays around October 21

Sources