Born on March 21 — Aries or Pisces?

Depending on the year you were born, Aries or Pisces.

Computed across 86 years, 1950–2035.

The boundary between two signs is not fixed to a date. It is fixed to the moment the Sun crosses a point in the sky, and that moment drifts a little from year to year. So two people born on the same date in different years can have different signs.

Year by year

the sign changes during this day — 1950 · 1951 · 1952 · 1953 · 1954 · 1955 · 1956 · 1957 · 1958 · 1959 · 1961 · 1962 · 1963 · 1965 · 1966 · 1967 · 1969 · 1970 · 1971 · 1973 · 1974 · 1975 · 1977 · 1978 · 1979 · 1981 · 1982 · 1983 · 1985 · 1986 · 1987 · 1989 · 1990 · 1991 · 1994 · 1995 · 1998 · 1999 · 2002 · 2003 · 2006 · 2007 · 2010 · 2011 · 2014 · 2015 · 2018 · 2019 · 2022 · 2023 · 2027 · 2031 · 2035

Where you were born changes the answer too

The Sun crosses the boundary at one single instant for the whole world — but the clock reading at that instant differs by country. Two people born at the same local hour, in different countries, can have different signs.

To know for certain

A date alone cannot settle a boundary day. The time and place of birth are needed to compute the sky at that exact moment.

This is an astronomical calculation, not a description of you. This page computes where the Sun was. It says nothing about your character or your future.