---
type: Knowledge Base
title: "Western Astrology Knowledge Base (西洋星座知識庫)"
description: "An Open Knowledge Format reference for Western sun-sign astrology: the twelve signs, four elements, three qualities and element-based compatibility."
resource: https://localpapa.com/tools/horoscope.html
tags: [horoscope, zodiac, western-astrology, sun-sign, okf]
timestamp: 2026-06-21T00:00:00Z
---

# Western Astrology Knowledge Base · 西洋星座知識庫

**Western (tropical) astrology** assigns a **sun sign** from a person’s birth date — one of twelve signs, each belonging to one of four **elements** (Fire, Earth, Air, Water) and one of three **qualities** (Cardinal, Fixed, Mutable). The sign sketches temperament, strengths and compatibility.

This is the **static knowledge layer** in [Open Knowledge Format](https://cloud.google.com/blog/products/data-analytics/how-the-open-knowledge-format-can-improve-data-sharing/): stable, human- and agent-readable definitions. The **dynamic layer** — finding a sun sign from a date — runs 100% in the browser at <https://localpapa.com/tools/horoscope.html>, with nothing uploaded.

> Scope: **sun sign only** (by birth date), not a full natal chart (which needs birth time and place). For entertainment and reference.

## Navigate

- [The Twelve Signs](./signs/index.md) — 十二星座
- [The Four Elements](./elements/index.md) — 四元素
- [The Three Qualities](./qualities/index.md) — 三性質
- [Blood Type Personality](../bloodtype/index.md) — 星座 × 血型 (combine for a richer reading)

## Compatibility

Compatibility is read mainly from **elements**:

- **Harmonious (契合)** — same element — similar values and pace, naturally in tune and easy together
- **Complementary (互補)** — fire-air and earth-water complement each other — stimulating or nourishing, a good match
- **Challenging (需磨合)** — quite different elements — differing rhythms and needs, calling for understanding and patience

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*Part of the [LocalPapa knowledge pack](../index.md). Tool: [Western astrology](https://localpapa.com/tools/horoscope.html).*