---
type: Knowledge Base
title: "Synastry Knowledge Base (雙人合盤知識庫)"
description: "An Open Knowledge Format reference for reading two birth dates across Western astrology, numerology and the Damo Yi Zhang Jing four pillars at once."
resource: https://localpapa.com/tools/synastry.html
tags: [synastry, compatibility, astrology, numerology, yizhang, okf]
timestamp: 2026-08-18T00:00:00Z
---

# Synastry Knowledge Base · 雙人合盤知識庫

**Synastry** here means reading two people together across three systems at once: the **aspect** between their sun signs, the **relationship number** their life paths add up to, and how their **Palm Sutra four pillars** interlock. The point is not three readings but one — the three are mapped onto shared axes so their agreement, and more usefully their disagreement, can be read.

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/). The **dynamic layer** — pairing two actual birth dates — runs 100% in the browser at <https://localpapa.com/tools/synastry.html>, with nothing uploaded.

## Navigate

- [Reading Three Systems Together](./method.md) — 三層合參 (axes, consensus, and the six disagreements)
- [Sign Aspects](./aspects.md) — 合盤相位 (the seven aspects between two sun signs)
- [Relationship Number](./relationship-number.md) — 關係靈數 (the number of the relationship itself)
- [Pillar Pairing](./pillar-pairing.md) — 四柱配對 (which area of a shared life works)
- [Group Reading](./group.md) — 多人合盤 (structure across a whole group)

## The three layers

| Layer | Measures | Granularity |
| --- | --- | --- |
| [Astrology](../horoscope/index.md) | temperament and pace | whole life, fixed |
| [Numerology](../numerology/index.md) | life lessons and values | whole life, fixed |
| [Palm Sutra](../yizhang/index.md) | **which area** of a shared life | four pillars, by domain |

The asymmetry in that last column is what makes the combination worth doing: astrology and numerology describe **who these two people are**, while the Palm Sutra alone can say **where** a relationship works and where it binds.

> For entertainment and cultural reference. Three interpretive traditions read together are still three interpretive traditions.

---
*Part of the [LocalPapa knowledge pack](../index.md). Tool: [pair two birth dates](https://localpapa.com/tools/synastry.html).*