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Asteroids and Synastry

Couple cuddling

What is a synastry?

Synastry is a branch of astrology that examines how the positions of planets in one person's birth chart relate to those in another person's natal chart. It's a tool in Astrology for assessing compatibility in love and understanding the dynamics of a relationship by comparing key elements like the Sun, Moon, Venus, Mars, and more. Synastry helps identify areas of harmony, challenges, and attraction between individuals based on their astrological profiles.

The role of Asteroids in synastry

When it comes to synastry, our curiosity is often endless and Asteroids can come handy when trying to understand the dynamics between two people. Here are my thoughts on the most common asteroids/centaur used in synastry.

Black Moon Lilith in relationships

Ah, Lilith. A quick google search will have your head spinning when it comes to Lilith and relationships. Her myth is quite interesting for sure, unleashed, raw feminine figure who has no master and is empowered, sexual and untamed.

When it comes to synastry and relationships, my opinion is that Lilith is overrated. I don't consider Lilith to be particularly relevant in synastry when it comes to longevity and compatibility. Lilith is for sure an indication of chemistry, especially so when you find contacts between Venus and Lilith or Mars and Lilith in synastry.

A synastry with a strong Lilith will have a component of sexual chemistry and exploration. You don't feel judged, shy, or self-conscious with your partner. There is an element of sexual spark and fun that keeps you interested and excited, but I would not give it more value than that.

Chiron in synastry

Chiron is most definitely an interesting centaur and especially so when it comes to relationships. Chiron represents wounding and healing, and if you've been in a few relationships, you know that these themes are always present in important relationships. Chiron conjunct personal planets is quite common in synastry, as well as hard or flowing contacts to personal planets. In particular, Chiron in aspect to Sun, Moon, Venus is rather common.

Is your relationship doomed because you have a hard aspect from Chiron to a personal planet in synastry? No. I did notice that when Chiron is in hard aspect to Moon in synastry, there is an element of hunger that is quite noticeable. No matter how much love and closeness you experience with your partner, there seem to be a constant need for more.

Flowing aspects of Chiron in synastry will bring healing. Hard aspects of Chiron in synastry will bring healing as well, but there will be a painful friction throughout the process. Do note that relationships thrive on friction, that is what keeps us interested.. A hard aspect of Chiron in synastry is not something that would make me run the other way, however, I do think that if you have a Chironic synastry with someone, you both need to be mature and conscious in order to avoid projecting your own pain on your partner (this is anyways a good idea, but even more so when the relationship has a strong Chiron). Chiron - Mars can stand for a sexually healing relationship. Chiron-Sun is very often present in synastry of wedded partners.


Juno is a fun one. Sometimes you will see it described as an indication of the "wedded partner" asteroid, sometimes you will see it as the "mistress". Which one is it? Pretty big difference if you ask me.

Astro research has shown that Juno is definitely prominent in wedded partners, and my own experience does correlate. I don't consider Juno to be an indication of mistress/cheating/betrayal, and, according to the research I quote, the most frequent aspects between wedded partners were Juno in aspect to Sun, and Juno in aspect to Juno (conjunction and opposite were the highest).

Juno - Venus is common in synastry where there is a lot of attraction and appreciation, while Juno-Sun in flowing aspects stand for a partner that represents an ideal. Juno in aspect to Vertex and North node is also a very common one.


Ceres is often prominent in synastry, both from research and personal experience. Ceres stands for nurturance and care, and I've seen quite a few synastry were Ceres was in aspect to Sun or other personal planets (Moon and Jupiter in particular), most frequently by trine and sextile aspects from my own experience, but research has shown hard aspects (conjunction, opposition) to be very relevant too.


Ah, the Vertex. So much romance around that one too. I did notice that the vertex was often in aspect to Sun or Jupiter in important relationships. North node and Ascendant are also very common contacts for the vertex in synastry. The research I quote also found that Vertex aspects to North node was a common one in wedded partners. My personal experience has been aspects between Vertex and Sun to be significant in important relationships.

See also: Relationship & synastry:



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Feb 24, 2021

I don't really understand about Liliths, Chiron, and Juno. But prominent Ceres and Vertex are definitely the indicator in synastry.

My boyfriend and I have (my) Sun-(his) Vertex conjunction by 3 degrees, (my) Vertex-(his) Node conjunction by 3 degrees, (his) Mars-(my) Descendant conjunction by 1 degree, (my) Ceres-(his Sun) opposition by 3 degrees, his Sun/Moon midpoint squaring my Venus. We also have (his) Sun-(my) BML conjunction by 0 degree, (my) Mars&Vertex-(his) BML conjunction 2 degrees.

My best friend was born 2 days earlier than my boyfriend. She came out to me last year, she said she's bisexual and is in love with me. The astrological aspects I have with her are almost the same as the ones that I have…

Julia Topaz
Julia Topaz
Mar 11, 2021
Replying to

I haven't found Eros to be a determining factor. I've found it to be prominent in synastry charts where there was a lot of "hots" going on, which is always nice, but that's about the extent of it for me.

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