The main idea
Synastry compares two natal charts through cross-chart aspects and house contacts.
Lesson 71 of 100Relationship astrology
Synastry basics
Understand synastry basics and use the idea without overstating what a chart can prove.
Context and limits
Read the idea with these two checks so it stays clear and responsible.
- Use it in contextRelationship astrology works best when it describes interaction patterns and choices rather than compatibility destiny.
- Keep this limitConsent, context, communication, and safety matter more than any chart score.
A common misconception
A common mistake is treating synastry basics as proof that a relationship must succeed or fail.
A clearer way to read it: Relationship astrology describes interaction patterns. Consent, behavior, communication, and safety matter more than any score or contact. Keep this lesson rule visible. Synastry compares two natal charts through cross-chart aspects and house contacts.
Worked example
One person's Moon trine another's Venus is a cross-chart aspect, not a composite placement.
Try it yourself
List three cross-chart contacts and name the two functions involved.
Show the model answer
For synastry basics, use this model. One person's Moon trine another's Venus is a cross-chart aspect, not a composite placement. Follow the same rule in your answer and name the visible evidence. Then state what the result does not prove.
Check your understanding
What is the safest and clearest way to use synastry basics?
Show the reviewed answer
A responsible relationship answer explains interaction without claiming access to another person's motives or future behavior. Apply that rule to synastry basics and keep the final claim no broader than the evidence shown.