Free Astrology Calculator
Sun Sign Calculator
Your Sun sign is the zodiac sign the Sun was in when you were born, the sign people mean when they ask yours. Enter your birth date to find it. If you were born on a cusp day, add your birth time and place and the calculator settles it to the minute.
What Your Sun Sign Describes
The Sun describes your sense of self: what gives you energy, what you are proud of and the person you are becoming. Astrologers often describe it as the center of the chart, the light every other placement is read against. Your Sun sign is the style of that light, whether Aries directness, Taurus steadiness or Pisces imagination. Read more about the Sun in astrology.
How the Sun Sign Is Calculated
The Sun moves through the zodiac at about one degree a day and spends about 30 days in each sign. Because it never turns retrograde, its sign changes on nearly the same dates every year. The dates still shift by a day or two, because the calendar year is about six hours shorter than the solar year and the leap day corrects it every fourth year.
The calculator converts your local birth time to Universal Time with your birthplace's historical time zone rules, then finds the Sun's tropical longitude at that instant. Each sign is a 30 degree slice of the ecliptic, starting from the March equinox at 0 degrees Aries.
Why Birth Time Matters
Between 1900 and 2060, the Sun changed sign on about 3% of days, roughly 1 day in 30. If your birthday is one of them, the sign depends on the hour you were born. Without a time, the calculator checks every hour of your birth date (in every time zone, if you leave out the place) and shows each sign the Sun could have held.
With your birth time and place, the result also gives the exact degree and the house, the area of life where this placement works.
Born on the Cusp?
Astrologically there is no blend at a cusp: the Sun is in one sign or the next, and the change happens at a precise minute. People born on the day of the change are often told different signs by different sources, because a newspaper's date range cannot account for the year and time zone. Add your birth time and place and the calculator gives the exact answer, with how many minutes it was from the change.
How Accurate Is It?
Positions come from Selfgazer's astrology engine, the same one that draws the chart in your astro room: VSOP87 planetary theory through Astronomy Engine, with Chiron from Swiss Ephemeris tables. Tested against the Swiss Ephemeris, planets agree to within half an arcminute and house cusps to within a tenth of an arcminute. Your local birth time is converted with your birthplace's historical time zone rules, including past daylight saving changes. Everything is calculated in your browser, and nothing you enter is stored.
Sun Sign Dates
The day each Sun sign began in US Eastern Time across 1950 to 2050. The range is why cusp birthdays need a birth time: the same calendar date falls in different signs in different years.
| Sign | Usual Dates | Can Begin |
|---|---|---|
| Aries | March 20 to April 18 | March 19 to 21 |
| Taurus | April 19 to May 19 | April 19 to 20 |
| Gemini | May 20 to June 20 | May 20 to 21 |
| Cancer | June 21 to July 21 | June 20 to 22 |
| Leo | July 22 to August 22 | July 21 to 23 |
| Virgo | August 23 to September 21 | August 22 to 23 |
| Libra | September 22 to October 22 | September 22 to 23 |
| Scorpio | October 23 to November 21 | October 22 to 24 |
| Sagittarius | November 22 to December 20 | November 21 to 22 |
| Capricorn | December 21 to January 19 | December 21 to 22 |
| Aquarius | January 20 to February 17 | January 19 to 20 |
| Pisces | February 18 to March 19 | February 18 to 19 |
The Sun by Birth Year
Every day of a year, with the sign and degree of each planet, in the daily ephemeris.
- 1950s
- 1950195119521953195419551956195719581959
- 1960s
- 1960196119621963196419651966196719681969
- 1970s
- 1970197119721973197419751976197719781979
- 1980s
- 1980198119821983198419851986198719881989
- 1990s
- 1990199119921993199419951996199719981999
- 2000s
- 2000200120022003200420052006200720082009
- 2010s
- 2010201120122013201420152016201720182019
- 2020s
- 2020202120222023202420252026202720282029
Sun Sign Questions
What Is My Sun Sign?
Your Sun sign is the zodiac sign the Sun occupied at your birth. For most birthdays the date alone is enough. For birthdays within a day of a sign change, the year, time and place decide it, which is what the calculator above checks.
Why Do Zodiac Sign Dates Differ Between Sources?
The Sun enters each sign at a different minute every year, and that minute falls on different calendar dates in different time zones. Published date ranges round this to fixed days, so for cusp birthdays they can disagree. The calculator works from the actual position of the Sun.
Can I Find My Sun Sign Without a Birth Time?
Usually. The Sun changed sign on about 3% of days between 1900 and 2060, roughly 1 day in 30. On those days the calculator shows both possible signs until you add your birth time and place.
Is My Sun Sign the Same as My Star Sign?
Yes. Star sign, zodiac sign and Sun sign all mean the sign of the Sun at birth in the tropical zodiac, which is the zodiac Western astrology uses.
What Does the House of My Sun Mean?
The sign describes how the Sun works; the house describes where in life it works: home, work, relationships, friendships and so on. Houses need your birth time and place, because they turn with the Earth once a day. Add both and the calculator gives the house in Placidus or Whole Sign houses.