Fire sign — Astrology glossary

A fire sign is one of the three zodiac signs belonging to the fire element: Aries, Leo, and Sagittarius. Fire is associated with action, drive, warmth, and a forward-looking enthusiasm, so these signs are typically described as energetic, expressive, and quick to initiate. The three differ by modality, with Aries cardinal, Leo fixed, and Sagittarius mutable, which shapes how each directs its fire, whether by starting, sustaining, or roaming. Fire is considered compatible with air, which feeds it, and in tension with water, which dampens it. In a natal chart, the placement of fire signs and how many planets sit in them indicate where a person acts on impulse and instinct rather than caution. For example, someone with the Sun and Mars in fire signs tends to move first and reflect afterwards, leading with confidence but sometimes outrunning their patience.