Zodiac Sign Calculator

Which dates does the tool use for each sign?

Fixed month-and-day ranges, with the year ignored: Aries starts 21 March, Taurus 20 April, Gemini 21 May, Cancer 21 June, Leo 23 July, Virgo 23 August, Libra 23 September, Scorpio 23 October, Sagittarius 22 November, Capricorn 22 December, Aquarius 20 January and Pisces 19 February. Each sign runs up to the day before the next one starts, so Pisces ends on 20 March.

Why do other sites show a different sign for my cusp birthday?

The Sun changes sign at a precise moment that moves by up to a day from one year to the next, while this tool uses one fixed date per boundary. For example, the Sun reached the start of Aries on 20 March in many recent years, yet the tool puts 20 March in Pisces every year. If you were born within a day of a boundary, a year-specific table or an ephemeris is the only way to be sure.

Do birth time and birthplace change the result?

No. Only the month and day of the date are read. The year, the hour and the place are never used. Time and place matter for other chart points such as the Moon or the rising sign, but for the Sun they only matter on a cusp day, and the tool cannot resolve those.

Is this the tropical or the sidereal zodiac?

Tropical, which is the Western standard. The twelve signs are 30-degree slices measured from the March equinox, so they no longer line up with the constellations that share their names. Indian (Vedic) astrology uses the sidereal zodiac, which gives a different sign for most people; the Vedic Rashi calculator on this site covers that.

What do the Element, Quality and Ruling Planet rows mean?

They are conventional classifications. The four elements (Fire, Earth, Air, Water) and the three qualities (Cardinal, Fixed, Mutable) combine so that each sign has a unique pair. For ruling planets the tool shows the modern assignments, Pluto for Scorpio, Uranus for Aquarius and Neptune for Pisces, where traditional astrology gives Mars, Saturn and Jupiter.

Where do the key traits, compatible signs and lucky numbers come from?

They are fixed lists written into the tool, one per sign, so every person with the same sign sees identical text. They are traditional associations, not measurements of anyone. Astrology is a belief-based practice that has not been scientifically validated, and nothing here predicts anything about you.

How does it treat a leap-day birthday?

February 29 falls inside the Pisces range (19 February to 20 March), so a birth on 2000-02-29 returns Pisces: Water, Mutable, ruled by Neptune. Leap years do not shift any other boundary in the tool.

What does this calculator not do?

It does not compute a moon sign, rising sign or any planetary position, and it does not write a horoscope or a forecast. It also does not check whether a day exists in a month beyond basic range limits, so use the date picker rather than typing.