Zodiac dates usually refer to the period when the Sun travels through each of the twelve tropical zodiac signs. Popular birthday tables provide convenient ranges, but the precise moment of a solar sign change can shift by a day from one year to another and varies by time zone.
The seasonal sequence of the twelve signs
Aries starts at the March equinox in tropical astrology, followed by Taurus, Gemini, Cancer, Leo, Virgo, Libra, Scorpio, Sagittarius, Capricorn, Aquarius and Pisces. The tropical zodiac measures a twelve-part seasonal circle beginning at 0 degrees Aries, rather than matching the visible boundaries of constellations. That distinction is important when comparing Western and sidereal systems.
Why birthdays near sign changes need care
A birthday on a commonly quoted boundary may fall under either adjacent Sun sign depending on year, location and time of birth. Published ranges are approximations, not individual calculations. To resolve a boundary date, calculate the Sun’s longitude for the exact birth moment using an ephemeris or chart calculator.
Beyond a birthday Sun sign
The calendar date identifies a solar placement but not the Moon sign, rising sign, houses or full pattern of aspects. Different people born on the same date may therefore have noticeably different charts. For deeper readings, combine the Sun sign with a properly timed natal chart.
Continue exploring
For the wider context, return to Zodiac Signs. Related topic pages in this section expand these ideas with placement-specific interpretations.