“Are horoscopes real?” In Mexico it comes up on forums all the time, in these exact words: “¿Qué tan cierto son los horóscopos?”, how true are horoscopes? It gets asked with a half smile, sometimes with real doubt, and it has a right to an honest answer.

A horoscope is true for whom?

A magazine or app horoscope starts from one thing only: your Sun sign, the sign the Sun was in on the day you were born. So it speaks at once to everyone born in the same stretch of a month, roughly one twelfth of humanity. It can be on target, the way a regional weather forecast is on target for a whole region. What it ignores is your birth time and your story.

That’s why it feels uncanny one day and way off the next. A sentence broad enough to fit everyone feels personal: psychologists call it the Barnum effect. Doubting is healthy.

What your birth chart has on top of that

Your birth chart, also called a natal chart, is a snapshot of the sky at the minute and the place you were born. It needs your date, time and place. It puts every planet, the Sun included, in signs and in twelve houses, and it shows the angles they form with each other.

Three points already give a good picture, your big three: the Sun, what sets you in motion; the Moon, what you need to feel safe; the Ascendant, your way of meeting the world. Two people with the same Sun sign can have opposite Moons and Ascendants and be nothing alike. Read your Sun sign is not enough, then the Ascendant and the Moon.

So is astrology real or not?

It depends on what you ask of it. If you expect it to announce what will happen to you on Tuesday, it will let you down.

The astrology AstroLuma follows, the humanistic astrology of Dane Rudhyar and Christophe Guillaume, reads differently. It describes dynamics: the way you love, protect yourself or get angry. It’s tested against your own life, when you read your chart and recognize yourself in it, or don’t. Nobody asks you to believe before you’ve read. For the difference in detail, read humanistic vs. predictive astrology.

And the daily horoscope?

It has its place, and AstroLuma publishes one too. It gives the sky’s climate for a sign, a mood to keep in mind, a subject to think about. It tells the weather for many people at once, while your chart tells who you are in that weather.

Where to start

First, calculate your chart with the free birth chart calculator. Look at your Sun, Moon and Ascendant, and read the articles about each. To see how it all holds together, how to read your natal chart walks you through it step by step. The full reading, reviewed and signed by Camille, tells your whole chart.

✦ Read your whole chart — the adult natal chart · $29.99 USD

The questions people ask

Why doesn’t my horoscope sound like me? It only looks at your Sun. Your Moon or your Ascendant may be in very different signs, and they’re often the ones that sound most like you.

Do I need my birth time? For the Sun and most planets, the date is enough. For the Ascendant and the houses, the time is essential.

In short

A horoscope speaks to a whole sign; your birth chart is calculated for you alone. The first gives a climate, the second shows your dynamics. Doubt is a good starting point: calculate your chart, read it, and see whether you recognize yourself.