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The birth chart: what it is and how to read it

A chart looks complicated because it shows a lot at once. It is really a table of four columns, and it reads top to bottom.

It is a snapshot, not a horoscope

A birth chart is the position of ten bodies at the moment of birth, and nothing else. Not a prophecy, not a personality verdict, not a diagnosis: simply where things stood that minute. Everything else is interpretation of that snapshot.

The difference from a Sun-sign horoscope is large. A horoscope takes one body — the Sun — and one thirty-degree arc of it. A chart takes all ten, and the exact degree of each.

Here is a chart, computed

Example: 15.6.1990, 14:30, Kyiv. The date is invented; the numbers are not — they come from the same code that computes your chart.

Four columns, each answering its own question.

Body

What is standing there. Ten of them: the Sun, the Moon and eight planets. The Sun and Moon are not planets — the tradition calls them luminaries — but they are computed alongside the rest.

Sign

Which of the twelve thirty-degree arcs the body landed in. This answers “how”: in what manner the thing that body stands for operates.

Degree

Where exactly inside the arc. It looks like a detail, but the degree is what decides whether the body forms an angle with another — and angles are what most of the interpretation is built from.

House

Which area of life it shows up in. There are twelve houses, and they depend not on the date but on the minute and place of birth. Without a birth time this column cannot be computed — and then we leave it empty rather than quietly substituting noon.

What order to read it in

The commonest beginner mistake is to start with the rare and dramatic: Pluto, squares, “karmic nodes”. The order that gives the most for the least time:

• The Sun — sign and house. What the rest turns around.
• The Moon — sign. How you react before you have time to think.
• The ascendant — if the birth time is known. How you read to people who do not know you yet. It has its own article.
• Mercury, Venus, Mars — the fast bodies: talking, valuing, acting. These are personal and differ from person to person.
• Jupiter and Saturn — slower: where you get luck and where you have to earn it.
• Uranus, Neptune, Pluto — last. They spend years in a sign, so you and your classmates share them.

Why two people of one sign have different charts

Because one out of ten matches. In the example above the Sun is in Gemini — but the Moon is in Pisces, Venus in Taurus, and Saturn in Capricorn moving backwards. Another person with the same Sun sign will almost certainly have a different Moon: it changes sign every two and a half days.

So “you are both Leos” is a statement about one twelfth of the sky, not about two people.

The angles between bodies

The fourth thing in a chart is not a column but a set of links. When two bodies stand a particular angular distance apart, the tradition calls it an aspect. In the example above the Moon and Pluto are almost exactly 120° apart — a trine, with an orb under one degree.

An “orb” is the tolerance: how far the angle may sit from exact and still count. Ours are 8° for a conjunction and an opposition, 7° for a square and a trine, 5° for a sextile, 3° for a quincunx — the same numbers across the whole site, and they are named on the About page.

This is why the degree matters. Two Suns in Gemini share a sign; a Sun at 5° and a Sun at 24° of Gemini form angles with entirely different bodies.

Why the chart is drawn as a circle

The table shows positions; the circle shows distances. A trine appears as a triangle, an opposition as a line through the centre, three bodies bunched in one sign as a cluster. The same data, but the eye takes it in faster.

The circle on this site is drawn from the same numbers as the table. It is not an illustration: if the table puts Saturn at 24° Capricorn, the circle puts it exactly there, to the pixel.

Three mistakes worth avoiding

• Reading a planet without its sign and house. “I have Mars” means nothing: everyone has Mars. The meaning comes from all three together.
• Treating the slow planets as personal. Pluto in Scorpio belonged to everyone born across twelve years. It is a generational backdrop.
• Looking for a yes or no. A chart does not answer questions about the future. It describes a leaning, not an event.

Try it on your own numbers

You can compute your chart right here: free, no sign-up. If you do not know your birth time, compute without it — nine rows out of ten stay correct. Unfamiliar words are in the glossary.

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