What is a planetary ingress, computationally?
An ingress is a root-finding event: a body’s declared longitude crosses a declared zodiac boundary in a named frame and direction. The result needs an ephemeris, time scale, frame, precision, search interval, and crossing direction. It is a calculated timestamp, not evidence that a real-world event will follow.
Direct answer
An ingress is a root-finding event: a body’s declared longitude crosses a declared zodiac boundary in a named frame and direction. The result needs an ephemeris, time scale, frame, precision, search interval, and crossing direction. It is a calculated timestamp, not evidence that a real-world event will follow.
Practical use
What to do with this answer
Search a bounded interval for every crossing, refine each root to the declared tolerance, and retain frame and direction. Never use one frame’s sign label with the other frame’s crossing time.
Distinctions to preserve
- Boundary crossing versus residence in a sign
- Tropical ingress versus sidereal ingress
- Calculated event time versus predictive claim
Limitations
- Display precision cannot exceed the underlying calculation and input precision.
- Interpretive meaning requires a separately identified tradition rule.
Authority graph
Which existing contracts carry the answer
These linked pages carry the underlying definition, method, or tradition record and its own sources. This page preserves their boundaries rather than becoming a new source of independent authority.
Sun ingress calculation reference →
Establishes: A Sun ingress is a root of the signed angular distance between its declared geocentric ecliptic longitude and a selected 30-degree zodiac boundary. Solar ingress is the longitude of the apparent geocentric Sun crossing a zodiac boundary; it is not the Sun physically entering a constellation.
Boundary: The crossing does not establish that a new life or business phase begins, that an event will occur, or that Sun causes an outcome.
Zodiac sign boundary sensitivity →
Establishes: A sign is a floor-based classification of normalized longitude into twelve 30° intervals; the continuous longitude is the underlying calculated fact.
Boundary: A stable sign classification does not make its interpretation empirically supported.
Jupiter transits without mixed coordinate systems →
Establishes: A Jupiter transit is first a time-indexed longitude. Sign ingress dates depend on the zodiac frame, and retrograde motion can produce several crossings of the same boundary.
Boundary: An ingress timestamp is astronomical geometry under a convention. Describing it as fortunate, expansive, or predictive is an astrological interpretation requiring a named rule and separate empirical testing.
Equivalent questions
These query forms resolve to this same answer identity; they are not separate claims.
- What does ingress mean in astrology?
- How is an ingress date calculated?
- Is a planet physically entering a sign?
- Why do tropical and sidereal ingress dates differ?
Non-claim
This answer is a method or tradition description. It is not a personalized reading and does not certify predictive validity, causation, medical outcomes, legal status, investment value, or guaranteed events.