Equinox

Definition

An equinox is one of two moments each year when the Sun crosses the celestial equator, making day and night approximately equal in length worldwide. The March equinox begins astronomical spring in the Northern Hemisphere and autumn in the Southern Hemisphere; the September equinox reverses those seasons.

Astrological Meaning

In tropical astrology, the equinoxes anchor two cardinal points of the zodiac. The March equinox marks the Sun’s ingress into 0° Aries, while the September equinox marks its ingress into 0° Libra. These points symbolize shifts in direction, initiative, balance, and relationship. Traditional and mundane astrologers may cast an ingress chart for the equinox to explore themes for the coming season, interpreting its Ascendant, planetary placements, aspects, and house emphasis in relation to a particular location.

Why It Matters

The equinox connects astrology’s symbolic calendar to an observable astronomical cycle. It helps explain why the tropical zodiac remains aligned with the seasons rather than the visible constellations. In chart interpretation, planets or angles near the equinoctial degrees may receive added attention, though their significance depends on the full natal, event, or mundane chart rather than the equinox alone.

Related Encyclopedia Entries

• Traditional Astrology
• Astrological Terminology
• Natal Chart