Give an experienced astrologer a chart they have never seen, and watch what happens in the first ten seconds. They do not start with the Sun sign. They look at the whole wheel and form an impression: lots of fire here, almost no earth; everything crowded into one half; Saturn sitting right on the Ascendant. Only then do they start reading planet by planet, and everything they read is colored by that first impression.

The chart signature is that first impression, written down. It is not an interpretation of any single placement. It is the summary of the chart as a whole: what it is made of, which planet runs it, what shape the planets make, and where the chain of authority finally ends. Our report calculates each of these and shows exactly how, because a summary nobody can check is only an opinion.

What the chart is made of: elements and modes

Every sign belongs to one of four elements. Fire (Aries, Leo, Sagittarius) acts and inspires. Earth (Taurus, Virgo, Capricorn) builds and keeps. Air (Gemini, Libra, Aquarius) thinks and connects. Water (Cancer, Scorpio, Pisces) feels and absorbs.

Every sign also belongs to one of three modes. Cardinal signs (Aries, Cancer, Libra, Capricorn) start things. Fixed signs (Taurus, Leo, Scorpio, Aquarius) keep things going. Mutable signs (Gemini, Virgo, Sagittarius, Pisces) adapt and change things.

The report counts where your planets fall, but not every planet counts the same. The Sun, the Moon and the Ascendant count 3 each, because they are the core of the personality. Mercury, Venus and Mars count 2. Jupiter, Saturn, Uranus, Neptune and Pluto count 1, since the slow planets are shared by everyone born in the same months or years. The result is two sets of bars, one for the elements and one for the modes, with the numbers beside them.

The interesting part is often what is missing. A chart with very little earth does not usually belong to someone who ignores practical matters. It more often belongs to someone who thinks about them constantly, makes detailed plans, and then feels slightly surprised each time the plan meets real life. The missing element tends to be the one a person over-corrects for.

Which planet runs the chart

Some charts have an obvious ruler. Others hide it. The report gives each planet points for the positions that traditionally give a planet authority, and names every point it awards:

Ruling the sign of the Ascendant: 5 points. Ruling the sign of the Midheaven: 3 points. Ruling the sign the Sun is in: 3 points. Ruling the sign the Moon is in: 3 points. Standing in its own sign: 4 points. Standing in an angular house, the 1st, 4th, 7th or 10th: 3 points.

The rulerships are the traditional ones, the system astrology used for most of its history: Mars rules Scorpio as well as Aries, Saturn rules Aquarius as well as Capricorn, and Jupiter rules Pisces as well as Sagittarius. This is why the outer planets rarely win: they rule nothing in this scheme, and can earn points only by sitting on an angle.

Here is how it works in practice. Imagine a chart with Sagittarius rising and Jupiter in Pisces in the 4th house. Jupiter rules the Ascendant (5), stands in its own sign (4) and is angular (3): 12 points before the Sun and the Moon are even considered, which usually makes it a very clear winner. The report lists the top five planets with their scores and the reasons, so you can see not just who won but by how much. A chart where the first planet has 12 and the second has 3 is run by one voice. A chart where the top three are tied is run by a committee, and the person may recognize the feeling of every decision needing a meeting.

The shape the planets make

In the 1940s, Marc Edmund Jones, the same astrologer who recorded the Sabian symbols, noticed that the way planets spread around the wheel says something on its own. The report sorts your ten planets around the wheel, looks for empty stretches of 60 degrees or more, and names the pattern:

Bundle: every planet inside a third of the wheel. A concentrated life, deep rather than wide. Bowl: every planet in one half, the other half empty, and a lifelong interest in what lies on the empty side. Bucket: a bowl with one planet alone on the far side, the handle, through which the whole chart pours. Locomotive: two thirds filled and one third empty, a pattern with its own momentum, pulled along by the planet at the leading edge. Seesaw: two groups facing each other, a life lived in alternation between two sets of demands. Splash: planets spread all around, wide interests at the cost of focus. Splay: uneven clumps with no regular pattern, a chart that insists on being read one placement at a time.

The report draws the wheel, shows which planets make up each group and the degrees they span, and names the handle or the leading planet when the shape has one.

The figures the aspects draw

Shape is about where the planets are. Aspect figures are about how they connect, and a chart with no tidy shape can still contain a textbook figure. The report looks for six: the grand trine (three planets in easy mutual trine), the kite (a grand trine with a fourth planet giving it direction), the T-square (an opposition with a third planet square to both), the grand cross (two oppositions squaring each other), the yod (two planets in sextile, both quincunx a third), and the stellium (three or more planets bunched together).

A figure only counts when every one of its legs holds at once, so the orbs are kept tight. Each figure is shown with its widest leg, how firmly it holds, and its element when it has one. The North Node and Chiron may take part, since neither needs a birth time.

Where the chain of authority ends

The last part is the dispositor chain. Each planet "answers to" the ruler of the sign it stands in. Venus in Aries answers to Mars; if Mars is in Capricorn, Mars answers to Saturn; if Saturn is in Capricorn, its own sign, the chain stops. Saturn is then the final dispositor, the planet every other planet eventually reports to.

Many charts have none. Sometimes two planets stand in each other's signs, Venus in Aries and Mars in Libra for example, and the chain closes in a loop. The report says so plainly: no single authority, two planets passing responsibility back and forth. That is a statement about the chart too.

How to use it

Read the signature first and the placements after. The signature tells you which parts of the chart will be loud and which will be quiet before you hear any of them. Most of it survives an unknown birth time: elements, modes, shape and figures come from the planets alone. What needs the time is the Ascendant's weight, the rulers of the angles and the angular houses. And remember that it describes a starting point. An empty element is a question the chart asks, not a door it closes.

When you are ready, calculate your chart signature here, and look first at the element you have least of.

Frequently asked questions

What is a chart signature?
The summary of a birth chart before interpretation: the balance of elements and modes, the planet that dominates, the shape the planets make around the wheel, the aspect figures, and the final dispositor of the rulerships.

How is the dominant planet calculated?
By points: 5 for ruling the Ascendant, 3 each for ruling the Midheaven, the Sun's sign and the Moon's sign, 4 for standing in its own sign, and 3 for an angular house. The report shows the top five with every reason listed.

Why do you use traditional rulerships?
Because the dispositor chain and the dominant planet are traditional techniques, and they give different answers under modern rulerships. Here Mars rules Scorpio, Saturn rules Aquarius and Jupiter rules Pisces.

What does a missing element mean?
Usually not an absence of that quality but a preoccupation with it. A chart with no earth often thinks about practical matters more, not less, than one with plenty.

Do I need my birth time?
For most of it, no. Without a time, the Ascendant is not counted in the elements and modes, and the dominant planet loses the points for ruling the angles and for angular houses. Everything else is calculated from the planets.