Understand the birth details and time conventions needed for a rising sign calculation, with clear limits on interpretation.
An astrological rising sign calculation uses birth date, accurate local birth time and birthplace coordinates. It also needs the historical time-zone offset, including any daylight-saving rule that applied then. A sun sign alone is insufficient.
The astronomical horizon changes with time and location. Using the wrong time zone or an approximate birth time can change the result, particularly near a boundary. An apparent discrepancy should first be checked against these inputs.
Software should identify its ephemeris and astrological conventions. Compare results only when those settings match. This guide does not silently assign a rising sign from incomplete information and does not include an ephemeris calculation engine.
Astrology is not an established scientific method for predicting personality or events. A technically calculated sky position does not validate an astrological interpretation. Treat it as a cultural or entertainment practice.
English edition: 16 September 2026.