A Sun sign is the zodiac sign containing the Sun’s calculated apparent position at a stated time. It is the placement used by most general sign horoscopes.
Published date ranges are convenient approximations, not a substitute for calculation near a sign boundary. The exact result depends on timestamp, timezone handling, and the chosen zodiac convention. Tropical and sidereal systems can return different sign labels because their reference points differ.
Astrological traditions associate the Sun sign with direction, identity, and purposeful expression. That description is a reflective convention, not a scientific personality category. A Sun sign alone does not summarize a complete birth chart.
The Sun sign is commonly grouped with the Moon sign and Ascendant as the Big Three. Their different roles and data requirements are set out in the Sun, Moon, and Rising guide.
General sign copy remains broad even when the position is calculated accurately. The reflective horoscope guide shows how to turn that copy into an optional question without treating it as a personal forecast.
Sources and further reading
The project methodology and official NASA/JPL Horizons documentation cover the calculated-position and independent-check layers. They do not establish the Sun sign’s traditional identity meanings.