Angles of the natal chart

The angles are built from two lines passing through the birthplace. The first is the horizon, the edge of the visible sky. The second is the meridian, an imaginary line from south to north through the highest point of the sky above you. These lines cross the ecliptic, along which the Sun moves and along which the zodiac signs lie, at four points.

The horizontal pair, the Ascendant and the Descendant, is often called the “self — others” axis. The vertical one, the MC and the IC, the “public — private” axis. These names are conventional: they are customary in the tradition and have not been proved by observation.

The Descendant is always exactly 180° from the Ascendant, and the IC from the MC. The sign of the Descendant therefore follows unambiguously from the sign of the Ascendant (opposite Aries is always Libra, opposite Cancer, Capricorn), and it adds no separate information. The same is true of the IC and the MC.

We do not call the Descendant and the IC independent “personality signs” and we do not build separate conclusions on them. In the chart they are shown as opposite points. The interpretation uses the sign of the Ascendant and the sign of the MC, and what follows from them: for example, the chart ruler, described in the article on the Ascendant.

The angles are linked with the houses. In the Placidus system, which we use, the Ascendant is the start of the first house, the MC the start of the tenth, the Descendant the start of the seventh and the IC the start of the fourth. How the other houses work, read in the article on houses in the natal chart.

The Midheaven is often linked with vocation, life’s work and standing in society. Those are words that are too strong. We read the sign of the MC more carefully: as a description of what a person looks for “in public view”, how they want to appear in their work and duties and what scale they are drawn to.

The sign of the MC does not indicate a profession, does not promise income or success and does not say whether anything will actually work out. It describes a tendency and a style, not a result. Decisions about work and study are not made by the chart, and the reading does not make them for you.

The Ascendant and the MC run around the whole zodiac circle in about a day, so on average they shift by 1° in 4 minutes. A sign occupies 30°, which on average is about two hours, but not always in practice: signs rise faster or more slowly depending on latitude. If you were born a few minutes from a sign boundary, even a small error in the time changes the conclusion.

The place affects the angles in different ways. The Ascendant is strongly affected by both longitude and latitude. The MC depends on longitude and time, and does not depend on latitude. So in one time zone but in different cities the MC usually shifts by a noticeable number of degrees.

We check the angles within ±2 minutes of the given time: if the sign of the Ascendant or the MC changes over that span, it is treated as unknown. If the time is given approximately, the calculation is repeated at both ends of the span, and an angle is named only where the result matches. For more on how this works and what to do if there is no time, see the article a chart without a birth time.

The angles are calculated only between 66° north and 66° south latitude: nearer the poles the Placidus house system becomes unreliable. Without a birth time there are no angles in the chart at all, just as there are no houses.

The example is fictional: the positions were invented for explanation and are not calculated from anyone’s data.

Together this may read as follows: a person who goes into things diplomatically and in public view wants to be a support for those around them. The Descendant and the IC add no separate conclusions here; they show what these traits are balanced against. It is a hypothesis for self-observation, not a verdict: the Sun, the Moon, planets in houses and aspects may refine the picture or soften it.

In the full reading the positions of the Ascendant and the Midheaven are shown when the time is known accurately enough, and the reading rests on their signs as separate factors of the chart. If the time is unknown, the reading says outright that there are no angles, and is built from what is known. You can see what this looks like in the open sample.

Where to begin reading a chart as a whole is explained in the article how to read a natal chart.

To see your own angles, build a chart: if you know the time exactly, they will be shown, and if approximately, the site will name only those that stay the same across the whole span. The Ascendant is covered in detail in the article what the Ascendant is.