Sibyl

From the stars

Plain writing about the things people actually ask me.

Free synastry calculator
Two astrological charts overlaid in gold and violet light

6 min read

What synastry actually is, and why sun signs cannot do it

Two whole charts laid over each other, and a reading of what touches what. It is the oldest use of astrology in relationships, and it is nothing like the compatibility grid you have seen.

Venus and Mars glyphs overlapping in gold light

5 min read

Venus conjunct Mars in synastry: the contact people mean by chemistry

One person's Venus meets the other's Mars. It is the most reliable attraction marker in the book, and the one that fades fastest if nobody feeds it.

A moon low over still water

5 min read

Moon to Moon in synastry: what happens at three in the morning

The quietest contact in the chart and the one that decides most. Not whether you love each other, but whether you need the same things when it is hard.

Saturn vast above two small figures

6 min read

Saturn in synastry: the contact that either builds it or grinds it down

The heaviest thing two charts can do to each other, and the one most often mistaken for someone not caring. Saturn is rarely withholding. Saturn is usually afraid.

A birth chart wheel with the house lines faded out

4 min read

How to do a synastry chart when you do not know their birth time

Most people do not have it. Here is exactly what you lose, exactly what still holds, and why a reading that quietly prints a rising sign anyway is lying to you.

Two charts merging into a third

5 min read

Composite chart or synastry: which one answers your question

Synastry reads what two people do to each other. A composite reads the relationship as a third thing with a chart of its own. They answer different questions and get used interchangeably.

A birth chart wheel in gold against a night sky

6 min read

Birth chart compatibility: the five contacts worth checking first

If you only look at five things in an overlay, look at these. They cover attraction, whether you can live together, whether you can talk, and whether it can be built on.

Two figures drawn in tarot style, turned toward and away

4 min read

Venus square Mars in synastry: attraction with an argument attached

The pull is completely real. So is the friction, and it is almost always about pace rather than about wanting different things.

Saturn hanging vast over a small figure at a threshold

5 min read

What your Saturn return really means

Around 29, Saturn finishes its first lap of your chart and hands you the bill for the life you've been improvising. It isn't punishment. It's the end of rehearsal.

A great luminous moon reflected in dark still water

5 min read

Your Moon sign, explained

Your Sun sign is the story you tell. Your Moon sign is what happens at 3am when nobody's watching — and it's the one that actually runs your life.

A hand tracing constellation lines across an open celestial map

6 min read

How to read your birth chart

A natal chart looks like a wiring diagram and reads like a language. Here's the grammar — planets, signs, houses, aspects — and the order to read them in.

Reading about it is one thing

Sibyl reads your chart aloud — and what the sky is doing to it today. Your chart is free to cast.

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