When we compare two natal charts and the aspects they make to one another,we are looking at the *Synastry* between the two individuals. This will shed light on the areas where there is easy harmony and the areas where there may be conflicts.
The word synastry is made of the Greek prefix syn, meaning 'a bringing together' and astron, meaning 'star'.
The descendant in the horoscope is the sign opposite the ascendant. The Ruler of this sign rules the 7th house. The seventh house is the house of relationships and therefore it is the area of primary focus in a study of synastry. This house, opposite the first (matters of the self), relates to the other people with whom you enter close association. Indeed, the sign on the cusp of the 7th house is the personality type with whom you are most comfortable and best suited.
According to traditional teachings, there are two elements respectively that fit well together, while the other combinations are more difficult. Fire and air are considered to be masculine elements that are related to each other and harmonize well, as do the feminine elements of earth and water.
In doing a comparison, first notice whether your companion has a predominance of planets in one of the elements. (More than four planets in one element would constitute a predominance. ) A predominance of planets in one element tells you what that person brings to the relationship, for example:
A person with a predominance of Fire signs brings an action oriented energy to the relationship.
A person with a predominance of Earth signs introduces a stabilizing influence on the relationship.
A person with a predominance of Air signs elevates the relationship to an intellectual level.
A person with a predominance of Water signs will confer on the relationship, deep emotional actions and reactions.
In general, people are more likely to be compatible with each other when their natal planets fall into compatible elements.
Further information can be obtained by weighing up the gender of signs:
Masculine: Aries, Gemini, Leo, Libra and Sagittarius (all the Fire and Air signs)
Feminine: Taurus, Cancer, Virgo, Scorpio, Capricorn and Pisces (all the Earth and Water signs)
A composite chart is a chart that is composed of the planetary midpoints of two or more horoscopes. For example, if one person's Venus is posited at 15 degrees Aries and the other at 15 degrees Libra, the midpoint of both parties Venus will be at 15 degrees Cancer. This is then known as the Composite Venus. All planets are followed through in this manner, as well as the Ascendant and this provides a whole new chart for a relationship. It gives an overview of the relationship rather than each person's involvement in it.
Practitioners of astrology commonly construct a composite chart when two people meet and form a relationship.
How to set up the Chart
A composite chart is composed by taking the midpoints of the combination of the two people’s corresponding planets. That sounds complex, but it’s not. For an example, each sign of the zodiac is composed of 30 degrees, and they continue on with each succeeding sign of the zodiac. So for the purposes of a composite chart you take the whole numbers of the signs and add them up.
Aries is 0-29, Taurus is 30-59, Gemini is 60-89, Cancer is 90-119, Leo is 120-149, Virgo is 150-179, Libra is 180-209, Scorpio is 210-239, Sagittarius is 240-269, Capricorn is 270-299, Aquarius is 300-329, and Pisces is 330-359.
For example, if your Sun is at 16 degrees of Aries your Sun number is 16 degrees. If your partner, friend, co-worker, next door neighbor or high school art teacher’s Sun is at Sagittarius of 12 degrees, that translates into a mathematical number of 252 degrees. Add the two of them together, 16 + 252 = 268 and divide by 2, which equals 134. That means that the midpoint of your Sun and the Sun of the person you are in a relationship with is at 14 degrees of Leo. That is the Sun of the composite relationship chart you share, and it is the placement of the Sun for your composite analysis.
You can do the same for all the planets: the Moon, Mercury, Venus, Mars, Jupiter, Saturn, Uranus, Neptune, Pluto, Chiron, and the North Node. You can do it for your combined Ascendants (if you have the time of birth for each of you), and for the Midheaven, the Tenth House.
Once you calculate all the above, you have a very detailed chart of the relationship you share with the person in question.
A composite report does not take into consideration the individuals involved but rather analyzes the relationship itself. This report averages the information from each of the charts and creates a new and separate entity that is the chart of the relationship itself. In a composite chart the idea is that the relationship is greater than (or at least not the same as) the sum of its parts. Individuals who have a "perfect" synastry comparison may not have an easy composite chart and the reverse is also true.
The Davison chart
is a chart drawn from actual terrestrial coordinates midway between you and your partner's places of birth, and an actual date and time midway between your birth dates and times.
So if you were born January 1 and your partner on Dec. 1, of the same year, the chart is drawn for June 1 (or whatever the exact date would be). And if you were born in New York, and your partner in Florida, the chart is drawn for a spot located somewhere around Maryland (or wherever the exact midway location would be).
questions can also be cast in regard to *Relationship questions*.
Here Deborah Houlding demonstrates how to go about this: