Ingresses — crossing into a sign

An ingress is a threshold. It is the moment a planet finishes crossing one zodiac sign and enters the next — leaving the last degree of one and stepping into the first degree of another. Nothing about the planet changes; what changes is the costume it wears, because a planet reads through the sign it stands in. An ingress is the sky changing that costume, and astrology marks the instant it happens.

Crossing the line

The zodiac is a circle of twelve thirty-degree signs. A planet moving forward eventually reaches the end of a sign and crosses into the next — that crossing is the ingress. The sign a planet occupies colours everything it does: the same Mars drive reads sharp and fast in Aries, slow and stubborn in Taurus. So the moment Mars changes signs, its whole tone shifts, and an astrologer watches ingresses to know when the flavour of a planet’s influence turns over.

The Sun’s ingress — the seasons

The most familiar ingresses are the Sun’s. The Sun enters a new sign roughly once a month, and four of those crossings are the turning points of the year: its ingress into the cardinal signs — Aries, Cancer, Libra, Capricorn — marks the equinoxes and solstices, the opening of spring, summer, autumn, and winter. The chart cast for the exact moment of the Sun’s ingress into Aries, the Aries ingress, is a classic tool for reading the tone of the season or the year it begins.

Fast and slow ingresses

How much an ingress matters depends on how rarely it happens:

• The fast bodies — the Moon, Mercury, Venus, the Sun — change signs often, so their ingresses shift the day-to-day mood: a new emphasis for hours, days, or weeks, then on to the next.
• The slow bodies — Jupiter, Saturn, and the outer planets — cross signs rarely, some only once in many years. Their ingresses are landmark events: a whole chapter of collective life takes on the character of the new sign, and astrologers anticipate these crossings long before they arrive.

When a retrograde stalls the crossing

An ingress is not always clean. If a planet turns retrograde near a sign boundary, it can cross the line, back up over it, and cross a third time — entering the new sign, retreating into the old, then finally committing. Those triple crossings stretch a single ingress into a drawn-out handover, and the tradition reads the back-and-forth as a threshold that has to be walked more than once before it holds.

Two zodiacs, two dates

An ingress is the one place the two traditions most visibly part. Western astrology uses the tropical zodiac, tied to the seasons; Vedic astrology uses the sidereal zodiac, tied to the fixed stars. The two are offset by a slowly growing angle — the ayanamsa — of roughly twenty-four degrees today. So a planet that has just entered a sign by the tropical reckoning may still sit in the previous sign by the sidereal one, and the same crossing is dated differently in each system. The event is one real motion through space; which sign it lands in is a matter of which zodiac is measuring.