The ascendant: definition, calculation and symbolic reading of the twelve signs

← Back to In-depth astrology

What is the ascendant?

The ascendant is the point of the ecliptic (the apparent path of the Sun across the sky) rising on the eastern horizon at the moment and place of birth. By extension, it is also the sign of the zodiac where this point falls. Saying “I have a Leo ascendant” means that Leo was rising in the east when you were born.

Unlike the Sun sign, which depends only on the date, the ascendant depends on the time and the place. The principle of the calculation is explained in detail on our page What is the ascendant?; this introduction goes further into how to read it and the precision it requires. Astrology is a symbolic tradition with no scientific validation: we present images and conventions here, never predictions.

A little history

The word “horoscope” comes from the Greek hôroskopos, “the one who observes the hour”: originally, it referred precisely to this point rising on the horizon. In Hellenistic astrology and up to the Renaissance, the ascendant and its ruler were at the heart of the reading of a chart. Until the end of the nineteenth century, tradition even gave the ascendant priority over the Sun sign.

The Sun sign came to the fore in the twentieth century with press horoscopes, which need only the date. Psychological astrology then restored the ascendant’s importance as a “mask” or an “entrance” into the chart. Today’s astrologers disagree about its relative importance.

The four angles of the chart

The ascendant is one of the four angles of the chart, the points where the zodiac meets the horizon and the meridian:

• the ascendant (ASC): the eastern horizon, the start of the first house;
• the descendant (DSC): the western horizon, the opposite point, the start of the seventh house;
• the midheaven (MC): the highest point of the ecliptic, the start of the tenth house in most quadrant house systems;
• the imum coeli (IC): the opposite point, beneath our feet, the start of the fourth house.

Astrologers see in the ASC-DSC axis the polarity of “me and the other”, and in the MC-IC axis the polarity of “public life and private life”. These associations are conventions, not findings. For details, see the introduction to the houses.

How long does a sign take to rise?

If the signs rose at equal speed, each would take about two hours. This is not the case: the Earth’s axis is tilted, and the ecliptic meets the horizon at an angle that changes over the course of the day. In the northern hemisphere, Aries and Pisces rise quickly, while Leo, Virgo, Libra and Scorpio rise slowly; in the southern hemisphere, it is the reverse. Here is the result of a calculation (tropical zodiac, latitudes of Paris and Marseille):

Sign rising on the eastern horizon	Duration in Paris	Duration in Marseille
Aries	about 58 min	about 1 h 07
Taurus	about 1 h 14	about 1 h 23
Gemini	about 1 h 49	about 1 h 53
Cancer	about 2 h 28	about 2 h 24
Leo	about 2 h 45	about 2 h 36
Virgo	about 2 h 45	about 2 h 35
Libra	about 2 h 45	about 2 h 35
Scorpio	about 2 h 45	about 2 h 36
Sagittarius	about 2 h 28	about 2 h 24
Capricorn	about 1 h 49	about 1 h 53
Aquarius	about 1 h 14	about 1 h 23
Pisces	about 58 min	about 1 h 07

The closer one gets to the equator, the closer the durations come to two hours; the further north one goes, the more they diverge. These values, calculated with the oblique ascension formula, give the order of magnitude mentioned on the ascendant page; they remain approximate (atmospheric refraction is neglected).

Why the time of birth must be precise

On average, the ascendant advances one degree every four minutes, but this pace is far from constant. A sign that rises in an hour passes twice as fast as one that takes two and a half hours. An error of 15 minutes therefore does not have the same effect everywhere:

Sign rising (Paris)	Minutes to cross 1 degree	Shift for a 15-minute error
Aries or Pisces	about 2 min	about 8 degrees
Taurus or Aquarius	about 2 min 30	about 6 degrees
Gemini or Capricorn	about 3 min 40	about 4 degrees
Cancer or Sagittarius	about 5 min	about 3 degrees
Leo, Virgo, Libra, Scorpio	about 5 min 30	about 2.7 degrees

So, if you are off by 15 minutes while Aries is rising, the ascendant can move from one sign to another; with Virgo on the horizon, you most often remain in the same sign. The practical consequence: if your birth time is approximate, note this, compare the calculated ascendant at both ends of the uncertainty, and read the portrait only as a hypothesis. Some astrologers practise “rectification” based on life events; this is a subjective method.

Finding your ascendant, in practice

1. Obtain the full copy of the birth certificate, which states the time, from the town hall of the place of birth (the short extract does not always include it).
2. Enter the date, the legal time and the city of birth into a natal chart calculation website or software. It converts the time to universal time, taking into account the summer time rules, which changed several times during the twentieth century.
3. Choose the tropical zodiac (the one used in Western horoscopes) and a house system; the ascendant itself is the same in most of these systems.
4. Compare two tools: if the ascendant differs, look for the cause (summer time, time zone, a city with the same name) before drawing a conclusion.

How to read an ascendant: five reference points

• The sign: its element, its modality, its traditional portrait (see the pages below).
• The ruler of the ascendant: the planet that rules this sign. In traditional astrology, its position (sign and house) is central to the reading.
• Planets close to the ascendant: if a planet lies within the few degrees before or after the ascendant (the orb varies between authors, from 5 to 10 degrees), it colours the reading.
• The aspects made to the ascendant by other planets.
• The first house: depending on the house system, it contains more or fewer planets.

An ascendant on its own says little: it is the combination that gives a reading. See our page Reading your natal chart step by step.

The twelve ascendants at a glance

Ascendant	Element and modality	Traditional ruler	Descendant
Aries	fire, cardinal	Mars	Libra
Taurus	earth, fixed	Venus	Scorpio
Gemini	air, mutable	Mercury	Sagittarius
Cancer	water, cardinal	the Moon	Capricorn
Leo	fire, fixed	the Sun	Aquarius
Virgo	earth, mutable	Mercury	Pisces
Libra	air, cardinal	Venus	Aries
Scorpio	water, fixed	Mars	Taurus
Sagittarius	fire, mutable	Jupiter	Gemini
Capricorn	earth, cardinal	Saturn	Cancer
Aquarius	air, fixed	Saturn	Leo
Pisces	water, mutable	Jupiter	Virgo

Each ascendant has its own page: ruler of the sign, corresponding Sun sign, nuanced ways of putting it and questions for reflection. The portraits describe archetypes of presentation, never real people.

Sun, Moon, ascendant: the basic trio

Modern astrology often brings together three reference points: the Sun (what we seek to become), the Moon (what we need) and the ascendant (how we present ourselves). This convention has an advantage: it encourages nuance, since each person combines three signs. It also has a limit: three signs do not make a chart, which contains dozens of factors (ten bodies, twelve houses, aspects). When the Sun and the ascendant are in the same sign (birth close to sunrise), people often speak of a portrait that is “more legible”; this is an idea from tradition, not a fact.

Pitfalls and a good way to read

Do not confuse the ascendant with the Sun sign: they cannot be deduced from one another without the time. Beware of the Barnum effect (we tend to find accurate any description vague enough to suit everyone, following Bertram Forer’s work in 1948). No solid study has shown that the ascendant describes a person’s appearance or way of being. Use it as a starting point for talking about yourself, preferring “this ascendant evokes…” to “you are…”. If a portrait makes you uncomfortable, or if a difficult period weighs on you, a health professional is a better person to speak to; the 3114 (suicide prevention, in France) answers day and night, and 112 (the emergency number across the European Union) in an emergency. See the index of in-depth astrology.

Frequently asked questions

Also read

The meanings mentioned belong to tradition and symbolism. They are neither promises of results nor medical advice. Back to In-depth astrology.