Western Horoscope (西洋星座) — askTIAN Metaphysics API

Overview

Western Horoscope analysis derives a natal chart from a birth date, computing Sun sign, Moon sign, Ascendant, and planetary positions across the twelve zodiac signs. Each placement carries elemental, modal, and dignity information that together paint a detailed portrait of character, potential, and life themes.

Origin

Western horoscopic astrology traces its roots to ancient Babylon (circa 700 BCE), where court astronomers first began casting individual birth charts. The tradition was systematised by Hellenistic scholars — most notably Claudius Ptolemy in his 2nd-century CE Tetrabiblos — and transmitted through Arabic, medieval European, and Renaissance channels to the modern era.

History

From Babylonian omen astrology to Hellenistic natal charts, through the Arabic translations of the 9th century and the Renaissance revival, Western astrology reached its modern form in the 20th century through the psychological astrology of Dane Rudhyar and Liz Greene, who integrated Jungian archetypes with traditional planetary symbolism.

How It Works

The askTIAN horoscope endpoint takes a birth date and computes the positions of the Sun, Moon, Mercury, Venus, Mars, Jupiter, and Saturn in the twelve zodiac signs. It returns dignities (domicile, exaltation, detriment, fall), element and modality profiles, and an LLM-generated synthesis narrative.

Good For

01Self-understanding and personality insight

02Career and vocation guidance

03Relationship compatibility

04Life timing and transits

05Psychological self-reflection

Use Cases

Natal Chart Reading

Generate a full natal chart breakdown for any birth date, returning Sun, Moon, Ascendant, and planetary placements with dignity analysis and a synthesised interpretation.

Personality Profiling

Use the element and modality profile to understand a person's dominant energies — fire/earth/air/water balance and cardinal/fixed/mutable distribution.

Famous Examples

Claudius Ptolemy2nd Century CE Alexandrian Scholar

Ptolemy's Tetrabiblos codified Hellenistic astrology into the systematic framework that underlies all subsequent Western astrological practice, establishing the rulerships, dignities, and house meanings still used today.

Key Terms

Sun SignThe zodiac sign occupied by the Sun at birth — the most widely known astrological placement, representing core identity and life purpose.

Ascendant (Rising Sign)The zodiac sign rising on the eastern horizon at the moment of birth, representing the persona and how one presents to the world.

Planetary DignityA measure of a planet's strength in a given sign: domicile (strongest), exaltation, detriment, or fall (weakest).

API Integration

The askTIAN Western Horoscope API computes Sun, Moon, Ascendant, and five classical planet positions for any birth date, returning dignities, element/modality profiles, and an LLM-generated synthesis.

Try It

200 OK·/trpc/horoscope.calculate

Run live

{
  "score": 76,
  "birthDate": "1990-01-15",
  "birthHour": 14,
  "placements": {
    "sun": {
      "sign": "Capricorn",
      "degree": 24.7,
      "house": 10,
      "dignity": "Domicile"
    },
    "moon": {
      "sign": "Taurus",
      "degree": 11.3,
      "house": 2,
      "dignity": "Exaltation"
    },
    "ascendant": {
      "sign": "Aries",
      "degree": 3.2
    },
    "mercury": {
      "sign": "Capricorn",
      "degree": 6.1,
      "house": 10,
      "dignity": "Neutral"
    },
    "venus": {
      "sign": "Pisces",
      "degree": 1.8,
      "house": 12,
      "dignity": "Exaltation"
    },
    "mars": {
      "sign": "Capricorn",
      "degree": 19.4,
      "house": 10,
      "dignity": "Exaltation"
    },
    "jupiter": {
      "sign": "Cancer",
      "degree": 7.5,
      "house": 4,
      "dignity": "Exaltation"
    },
    "saturn": {
      "sign": "Capricorn",
      "degree": 28.2,
      "house": 10,
      "dignity": "Domicile"
    }
  },
  "sunSign": "Capricorn",
  "moonSign": "Taurus",
  "ascendant": "Aries",
  "dominantElement": "Earth",
  "dominantModality": "Cardinal",
  "aspects": [
    {
      "planet1": "Sun",
      "planet2": "Saturn",
      "aspect": "Conjunction",
      "orb": 3.5,
      "nature": "Intensifying"
    },
    {
      "planet1": "Moon",
      "planet2": "Jupiter",
      "aspect": "Opposition",
      "orb": 3.8,
      "nature": "Challenging"
    },
    {
      "planet1": "Mars",
      "planet2": "Saturn",
      "aspect": "Conjunction",
      "orb": 8.8,
      "nature": "Intensifying"
    }
  ],
  "synthesis": "A Sun-Saturn conjunction in Capricorn in the 10th house is one of the most career-defining placements in Western astrology. The native is built for long-term achievement — methodical, disciplined, and willing to delay gratification for lasting results. The Moon in Taurus in the 2nd house provides emotional stability and a deep need for material security; combined with Jupiter in Cancer in the 4th, the home and family are sources of genuine abundance.\n\nThe Aries Ascendant gives a direct, action-oriented exterior that can surprise those who expect Capricorn caution. Venus in Pisces in the 12th house adds a private, spiritually inclined dimension to the personality that rarely surfaces in professional settings.",
  "question": "What does my chart reveal about my career path?",
  "creditsUsed": 1,
  "responseTimeMs": 312
}