What Is a Composite Chart? The Midpoints of Two Birth Charts, Read as One Relationship

A composite chart is one chart made from two. For every pair of matching placements — your Sun and their Sun, your Moon and their Moon, your ascendant and theirs — you take the midpoint, and the set of midpoints becomes a new chart. It is read as the chart of the relationship itself: not you, not them, but the third thing you make together.

Not the same as synastry. Synastry compares two charts planet by planet — that's covered in synastry aspects explained, and the Vedic version in Vedic synastry vs Western. A composite is a different technique that usually comes after it.

How the midpoints are calculated

Treat the zodiac as a 360° circle starting at 0° Aries. Convert each placement to a number, find the point halfway between the two, and convert back. The examples below use made-up placements to show the arithmetic — they aren't anyone's real chart.

Example 1 — the simple case

Person A's Sun: 10° Aries = 10°

Person B's Sun: 20° Gemini = 80°

(10 + 80) ÷ 2 = 45° → composite Sun 15° Taurus

Example 2 — the wrap-around trap

Person A's Venus: 25° Pisces = 355°

Person B's Venus: 5° Taurus = 35°

Plain averaging gives 195° (15° Libra) — the far midpoint, on the opposite side of the circle. The two Venuses are only 40° apart across 0° Aries, so the near midpoint is 15° Aries, and that is the one the composite uses.

Every pair has two midpoints, exactly opposite each other. The composite method — popularised by Robert Hand's Planets in Composite — takes the nearer one. Software does this for you; doing one by hand is the fastest way to understand what you're looking at.

The angles are the awkward part. You can average the two midheavens (MC) the same way, but averaging the two ascendants often produces an ascendant that doesn't fit the composite MC for any place on Earth. Many astrologers instead take the midpoint MC and derive the ascendant from it for the place the couple lives. Different software makes different choices here, which is why two composite charts for the same couple can show different rising signs.

Composite vs synastry vs Davison

Method	How it works	The question it answers	What you need
Synastry	Two birth charts side by side. Each planet in one chart is compared with each planet in the other.	How do we affect each other? Where do we spark, soothe, or grind?	Both birth dates. Times for house overlays and the Moon.
Composite	One chart. Each placement is the midpoint of the two matching placements (Sun with Sun, Moon with Moon…).	What is the relationship itself like — its purpose, its climate, its weak spot?	Both birth dates. Both accurate times for the angles and houses.
Davison	One chart, cast for a real moment: the midpoint between the two birth dates/times and birthplaces.	The same question as the composite, from a chart that is a real sky.	Both birth dates, times and places.

The composite's known weakness is that it can produce a chart no real sky could. In a real chart Mercury is never more than about 28° from the Sun. In a composite, if one pair of planets sits close to opposite each other, a small difference decides which midpoint is nearer — so composite Mercury can land on the far side of the zodiac from composite Sun. The Davison chart, developed by Ronald Davison, avoids this by averaging the birth moments and places instead and casting a chart for that real time. Many astrologers look at both; where they agree, take it seriously.

What to read first in a composite

The composite Sun's house — what the relationship is for. (Table below.)
The composite Moon — the emotional climate day to day, and what makes it feel safe. For what Moons mean between two people in synastry, see Moon sign compatibility.
Composite Venus and Mars — how affection and desire actually move in the pair, which may be different from how either of you loves alone.
Composite Saturn — where the relationship feels heavy, tested, or duty-bound, and where it builds something durable.
Aspects within the composite — read them as you would in a single birth chart. A composite Sun square composite Saturn is a tension built into the pair, not a fault in either person.

Composite Sun in each house

Houses here are whole-sign, counted from the composite ascendant's sign — the same system we use everywhere on Consciera. That means this table only applies if both of you know your birth times; without them, there is no composite ascendant and no houses.

Composite Sun in	What the relationship is for	Its typical trap
1st — self, identity	The relationship is a visible unit. People say your names together, and the pair has a personality of its own that walks into a room before either of you does.	One or both of you stops having a separate name.
2nd — money, values	The relationship is built around building: a shared account, a home bought, a sense of what you two value and will pay for. Security is how it says love.	Comfort replaces aliveness; the budget becomes the relationship.
3rd — talk, daily mind	Conversation is the bloodstream. You think out loud together, swap books, run errands as a two-person team, and the texts never really stop.	Talking about a decision for months instead of making it.
4th — home, roots	This is a home first and a public couple second. The relationship lives in the kitchen, the family it builds or joins, the private base nobody else sees.	Closing the door on everyone else until the house feels small.
5th — romance, play, children	Fun is the glue. Dates, creative projects, children if you want them, risk taken for the joy of it. It stays alive as long as it stays playful.	Treating the first dull stretch as proof it is over.
6th — work, routine	The relationship works through shared tasks: a business, a garden, a care routine, showing up for each other on an ordinary Tuesday. Love here is practical service.	Becoming co-managers of a to-do list with no time off duty.
7th — partnership, commitment	The classic committed-partnership placement: the relationship is about being a pair, contracts and promises included. The 7th also holds open conflict, so disagreements are out in the open.	Keeping score of who gave more.
8th — intimacy, shared resources	Intense, private, and transforming. Neither of you leaves it the same person. Joint money, debt, inheritance and sex all carry more weight than usual.	Control — of money, of information, of each other.
9th — meaning, travel, study	The relationship grows by going somewhere: travel, a move abroad, study, a shared belief or philosophy. It needs a horizon.	A big shared vision while nobody pays the electricity bill.
10th — career, public role	The relationship has a public face: a working partnership, a couple known in their field, a reputation built together. It is often about what you two achieve.	Managing how it looks over how it feels.
11th — friends, groups, the future	Friendship sits at the centre. You share a circle, causes, plans for years ahead. The relationship is oriented to the future more than the present.	Drifting from partners into very good friends without noticing.
12th — solitude, the hidden	A retreat from the world: private, quiet, sometimes spiritual, sometimes literally hidden. Much of what holds it together goes unsaid.	The unsaid includes the problems, too.

Using a composite for timing: the stations to check

Astrologers also track transits to the composite, the way they track transits to a birth chart. The strongest are planets stationing — standing still before changing direction — on or near a composite planet. Here are the stations from now through Jupiter turning direct in April 2027, from NASA JPL Horizons data. If your composite has a planet within a degree or two of one of these (or of the same degree in the signs listed, which form a conjunction, square or opposition), that's the period to watch:

Date	Station	Degree	Check your composite for
Nov 13, 2026	Mercury turns direct	5°02 Scorpio	Composite planets near 5° of Scorpio, Taurus, Leo or Aquarius
Nov 14, 2026	Venus turns direct	22°52 Libra	Composite planets near 23° of Libra, Aries, Cancer or Capricorn
Dec 11, 2026	Saturn turns direct	7°56 Aries	Composite planets near 8° of Aries, Libra, Cancer or Capricorn
Dec 13, 2026	Jupiter turns retrograde	27°01 Leo	Composite planets near 27° of Leo, Aquarius, Taurus or Scorpio
Jan 10, 2027	Mars turns retrograde	10°26 Virgo	Composite planets near 10° of Virgo, Pisces, Gemini or Sagittarius
Feb 9, 2027	Mercury turns retrograde	5°59 Pisces	Composite planets near 6° of Pisces, Virgo, Gemini or Sagittarius
Mar 3, 2027	Mercury turns direct	20°55 Aquarius	Composite planets near 21° of Aquarius, Leo, Taurus or Scorpio
Apr 1, 2027	Mars turns direct	20°56 Leo	Composite planets near 21° of Leo, Aquarius, Taurus or Scorpio
Apr 13, 2027	Jupiter turns direct	17°00 Leo	Composite planets near 17° of Leo, Aquarius, Taurus or Scorpio

Read the station through the planet: Saturn stationing on composite Venus tends to bring a commitment question; Mars stationing on the composite Sun, friction or a push to act. A station doesn't make anything happen — it marks a period when the pattern already in the composite is easier to see. The full context for each is in Venus retrograde 2026, Jupiter retrograde in Leo and Mars retrograde in Virgo.

What a composite chart can't tell you

Without both birth times, there are no composite angles or houses, and the composite Moon is uncertain: the Moon moves roughly 12–15° a day, so an unknown time can move the composite Moon by several degrees, sometimes into the next sign.
It doesn't say whether you should be together. A composite describes the shape of a relationship that exists. It can't tell you if it will last, and a "hard" composite is not a reason to leave.
It can describe a relationship that never happens. You can compute a composite for any two people — including two strangers. The chart only means something once there's a relationship for it to describe.
It doesn't replace synastry. The composite shows the pair; synastry shows how each person experiences the other. Two people can share a warm composite and still find each other's Saturn heavy.

Where to start

Begin with synastry — it's the layer you can read with fewer data, and it tells you how each of you lands on the other. Then, if you both have accurate birth times, build a composite (and a Davison, if your software offers it) and read the composite Sun's house first. For the placements beyond the Sun that feed both techniques, see the beyond sun signs guide.

Astrology is a tool for reflection, not fate. A composite chart describes a pattern in a relationship; it doesn't decide the relationship.

Frequently asked questions

What is a composite chart?

A composite chart is a single chart built from two birth charts by taking the midpoint of each matching pair of placements — one person's Sun and the other's Sun, Moon and Moon, and so on. It is read as the chart of the relationship itself, not of either person.

What is the difference between synastry and a composite chart?

Synastry lays two birth charts side by side and reads the aspects between them: how each person affects the other. A composite merges the two into one chart and reads what the pair becomes together. Synastry answers "how do we interact?"; the composite answers "what is this relationship for, and what is it like?"

What is the difference between a composite and a Davison chart?

A composite averages the planet positions themselves. A Davison chart averages the two birth dates, times and places, then casts a real chart for that midpoint moment and location. Because a Davison is a real sky, its planets always sit in physically possible positions; a composite can produce combinations that never occur in an actual sky.

Do I need birth times for a composite chart?

For the planets from the Sun to Pluto, approximate times are enough — except the Moon, which moves roughly 12 to 15 degrees a day, so an unknown birth time can shift the composite Moon by several degrees and sometimes a sign. The composite ascendant, midheaven and houses need both accurate birth times.