Birthday Zodiac Signs: Birth Months and Cusp Days
Find the sign of a birthday
Month and day are enough. Add the year only if you want the date checked against it.
Your zodiac (Sun) sign follows from your birthday. Every month holds two signs, and in US Eastern Time the switch comes between the 18th and the 24th, depending on month and year. On those change days, the year and time of birth decide the sign.
Your birth month
Each row names the month's two signs and change days; the link opens its day-by-day table.
Change days in US Eastern Time, birth years 1940-2026 (JPL Horizons); on those days the sign depends on the year and time of birth.
| Month | When the sign changes (US Eastern Time) |
|---|---|
| January zodiac signs | January: Capricorn until the Sun enters Aquarius. In US Eastern Time the change fell on January 19 in 19 years, January 20 in 67 years, January 21 in 1 year. |
| February zodiac signs | February: Aquarius until the Sun enters Pisces. In US Eastern Time the change fell on February 18 in 53 years, February 19 in 34 years. |
| March zodiac signs | March: Pisces until the Sun enters Aries. In US Eastern Time the change fell on March 19 in 2 years, March 20 in 73 years, March 21 in 12 years. |
| April zodiac signs | April: Aries until the Sun enters Taurus. In US Eastern Time the change fell on April 19 in 37 years, April 20 in 50 years. |
| May zodiac signs | May: Taurus until the Sun enters Gemini. In US Eastern Time the change fell on May 20 in 37 years, May 21 in 50 years. |
| June zodiac signs | June: Gemini until the Sun enters Cancer. In US Eastern Time the change fell on June 20 in 12 years, June 21 in 71 years, June 22 in 4 years. |
| July zodiac signs | July: Cancer until the Sun enters Leo. In US Eastern Time the change fell on July 22 in 55 years, July 23 in 32 years. |
| August zodiac signs | August: Leo until the Sun enters Virgo. In US Eastern Time the change fell on August 22 in 29 years, August 23 in 58 years. |
| September zodiac signs | September: Virgo until the Sun enters Libra. In US Eastern Time the change fell on September 22 in 38 years, September 23 in 49 years. |
| October zodiac signs | October: Libra until the Sun enters Scorpio. In US Eastern Time the change fell on October 22 in 10 years, October 23 in 72 years, October 24 in 5 years. |
| November zodiac signs | November: Scorpio until the Sun enters Sagittarius. In US Eastern Time the change fell on November 21 in 18 years, November 22 in 68 years, November 23 in 1 year. |
| December zodiac signs | December: Sagittarius until the Sun enters Capricorn. In US Eastern Time the change fell on December 21 in 57 years, December 22 in 30 years. |
Born on a cusp day?
The 27 dates below, where the Sun changed sign in US Eastern or Pacific Time in at least two birth years since 1940, each have a year-by-year page. "Cusp" is the popular word for them, but at the moment of birth the Sun is in one sign.
| Month | Cusp birthdays |
|---|---|
| January | January 19, January 20 |
| February | February 18, February 19 |
| March | March 19, March 20, March 21 |
| April | April 19, April 20 |
| May | May 20, May 21 |
| June | June 20, June 21, June 22 |
| July | July 22, July 23 |
| August | August 22, August 23 |
| September | September 22, September 23 |
| October | October 22, October 23, October 24 |
| November | November 21, November 22 |
| December | December 21, December 22 |
Why the change date moves
In US Eastern Time the Sun entered Aries on March 20 at 05:38 EDT in 2021, 11:33 in 2022 and 17:24 in 2023, then on March 19 at 23:06 in 2024. Each common year the moment comes about 6 hours later, because the astronomical year lasts almost 365¼ days; the February 29 leap day pulls it back. The date also drifts: Aries began on March 21 in 9 of the 30 birth years 1940–1969 and in none of 1997–2026. Zodiac signs has the full explanation.
Born on a change day? Enter your birth date, time, and city in the birth chart; without a birth time, the chart is calculated for 12:00 noon and marked as such. Reading meaning into a sign is an interpretive tradition, not a scientifically validated method.
Instead of relying on a single noon position, the calculator checks for any sign changes across your entire local birth date. If the Sun, the Moon, or another planet changes sign during that local day, the result shows each possible sign for that day rather than guessing a single one.
FAQ
What is my zodiac sign by date of birth and month? Find your month in the first table: the earlier sign runs until the change days, then the later one. Cusp days have their own pages.
Which months have two zodiac signs? All twelve. Each month starts in one sign and ends in the next; the table shows the days of the change.
How this page was made
Prepared by the Astrolivo editorial team from NASA JPL Horizons data and Wikipedia's "Astrological sign," "Leap year," and "Astrology and science" articles, fact-checked against them.