Calculate structured natal chart data from birth information. When birth time is unknown, preserve that uncertainty and omit time-dependent results such as the Ascendant and houses rather than assuming a default time.

Calculate planetary positions for a birth date and optional exact birth time and location. Returns structured placements supported by GetBirthChart.

Calculate the Sun, Moon, and Ascendant for a birth chart. If birth time is unknown, do not guess the Ascendant; return it as unavailable according to the GetBirthChart contract.

Calculate the Moon sign while preserving uncertainty when the Moon may have changed zodiac signs during a date with unknown birth time.

Calculate the Ascendant (Rising sign) from birth date, exact birth time, and location. An exact birth time is required; never infer or guess a Rising sign.

Calculate structured natal aspects between chart bodies using GetBirthChart's calculation methodology. Returns factual aspect data without interpretation.

Calculate structured synastry relationships between two birth charts. Returns factual inter-chart data without compatibility scores or relationship conclusions.