William and Catherine Synastry at a Glance
Prince William and Catherine’s synastry has 26 contacts between the two charts. Its tightest links his Ascendant to her Pluto, both their Mars are in Libra, and their composite and Davison charts share the same T-square.
William’s birth time comes from the bulletin issued the evening he was born; Catherine’s has never been released. Her side of the synastry is cast for noon, which keeps every planet contact but leaves out her Ascendant and houses.
He was born with the Sun at Cancer 0°07′, the Moon at Cancer 4°58′ and a Sagittarius Ascendant at 27°29′. Her Sun is at Capricorn 18°55′ and her Moon in Cancer.
A smaller list than most
Twenty-six synastry contacts is below the 31.1 average of two random people. Part of the gap is her missing Ascendant; part is that people born in the same year share their slow planets, which are not listed.
Born the Same Year
Catherine was born on 9 January 1982 and William on 21 June 1982, five months apart. In their synastry, that has a clear effect.
Shared slow planets
Jupiter, Saturn, Uranus, Neptune and Pluto move so slowly that their positions in the two charts almost coincide: both Neptunes are at Sagittarius 25°, for example. Contacts like that describe a generation, not a couple.
What this page lists instead
The contact list includes only contacts with at least one personal point: the Sun, Moon, Mercury, Venus, Mars or an Ascendant.
Composite and Davison nearly agree
Because the births are so close, the midpoint chart and the midpoint moment come out almost the same. That is why the same T-square appears in both relationship charts below.
Two Mars in Libra
His Mars at Libra 9°12′ and her Mars at Libra 10°21′ are 1.15° apart. Only 5.7% of random pairs have a Mars–Mars conjunction, the rarest contact in their synastry.
What a Mars–Mars conjunction is read as
Mars is how a person acts and asserts. In synastry, two Mars together are read as similar pace and similar ways of handling conflict.
Mars in Libra
Libra is read as seeking fairness and agreement, so Mars there is read as drive that prefers to negotiate. Here both people have it.
Why so rare
Mars returns to the same place about every two years, so a close Mars conjunction needs the right gap in age. Five months apart, their Mars had barely moved.
His Ascendant, Her Pluto and Neptune
William’s Ascendant at Sagittarius 27°29′ meets two of Catherine’s slow planets. It sextiles her Pluto at Libra 26°49′ within 0.67°, and it is 2.03° from her Neptune at Sagittarius 25°27′.
The tightest contact
Pluto sextile the Ascendant is read as depth and intensity entering the way a person meets the world. 15.5% of random pairs share this synastry contact.
Neptune on the Ascendant
Neptune on the Ascendant is read as an idealised first impression. 9.7% of random pairs have this conjunction.
Only his angles
Every angle contact here runs to his Ascendant; hers is unknown, so nothing can be drawn to it.
Air Trines: Mercury, Venus and Mars
Several contacts in their synastry are trines between air signs. His Mercury at Gemini 8°58′ trines her Mars within 1.38° and her Venus at Aquarius 7°20′ within 1.64°.
Mercury to Mars and Venus
Mercury–Mars is read as quick, energetic conversation; Mercury–Venus as talk that is easy and affectionate. Each is shared by about one random pair in six.
His Mars to her Venus
His Mars at Libra 9°12′ trines her Venus within 1.87°, one of the classic attraction contacts. 16.5% of random pairs have a Venus–Mars trine.
Her Venus was retrograde
Catherine was born with Venus retrograde, a placement astrologers read as a reflective, inward way of valuing things.
Saturn and Her Moon
His Saturn at Libra 15°30′ squares her Moon, 1.16° at noon. Her Moon is approximate, so the real orb could be anywhere up to several degrees.
What a Saturn–Moon square is read as
Saturn on the Moon is read as seriousness meeting feeling: steadiness for one person, a sense of restraint for the other. 16.3% of random pairs have this square.
Saturn and her Sun
His Saturn also squares her Sun at Capricorn 18°55′, 3.40° wide. Both Saturn contacts are read as responsibility shaping the relationship.
What Changes Without Catherine’s Birth Time
Catherine’s birth time has never been officially released. Her chart is cast for noon on 9 January 1982 in Reading.
Her Moon stayed in Cancer
Her Moon moved from Cancer 6°52′ to Cancer 21°47′ during the day. Its sign is certain; its degree, and so the orb of every contact to it, is not.
What is left out
Her Ascendant and houses, the composite Ascendant and the Davison Ascendant are not drawn. Every other planet in her chart moves too slowly in a day to change the contacts.
Catherine’s Moon Through the Day: What Changes in the Synastry
Her Moon stayed in Cancer, but it crossed 15° of the sign during the day. Recasting her chart for the first and last minute of 9 January 1982 shows which Moon contacts in their synastry depend on the hour.
Born just after midnight
Her Moon would be at Cancer 6°52′, conjunct his Moon within 1.90° and squared by his Mars within 2.34°. His Saturn would be out of contact with it.
Born just before midnight
Her Moon would be at Cancer 21°47′, squared by his Pluto within 2.38°, while his Saturn square would widen to 6.27°.
What holds
The two Mars in Libra, the air trines and his Ascendant contacts do not depend on her birth time. Only the Moon contacts do.
A T-Square in Both Relationship Charts
Their composite chart has the Sun at Aries 9°31′, the Moon at Cancer 9°40′ and Mars at Libra 9°47′. The Sun squares the Moon within 0.14°, the Moon squares Mars within 0.13° and the Sun opposes Mars within 0.27°.
What a T-square is read as
A T-square is read as a pattern of pressure that drives effort: here identity, feeling and action pulling in three directions. It is a working pattern, not a warning.
The approximate Moon
The composite Moon comes partly from Catherine’s Moon, so its exact degree is uncertain. The Sun–Mars opposition does not depend on it.
The same pattern in the Davison chart
Their Davison chart repeats it: the Davison Moon squares Mars within 0.42°, the Sun squares the Moon within 0.61° and the Sun opposes Mars within 1.03°.
The Davison Chart: 1 April 1982, Near Windsor
Their Davison chart is cast for 1 April 1982 at 04:01 UT, halfway in time between January and June 1982. The place is halfway between Paddington and Reading, near Windsor.
An Aries Sun, a Cancer Moon
The Davison Sun is at Aries 11°07′ and the Moon at Cancer 10°30′, a waxing crescent. The Davison Sun is 1.6° from the composite Sun.
Why it is so close
The births are less than half a year apart, so the midpoint in time and the midpoint of the two charts land in nearly the same place.
Where Their Birth Data Comes From
One side of this synastry rests on an official announcement, the other on a birth date.
William: the palace bulletin
The bulletin issued on 21 June 1982 read: “This evening at 9.03 o’clock, Her Royal Highness The Princess of Wales was safely delivered of a son… at St Mary’s Hospital, Paddington.” The chart uses 21:03 British Summer Time.
Catherine: date and place
She was born on 9 January 1982 at the Royal Berkshire Hospital in Reading. Her birth time has never been released, and the times found in astrology databases cannot be traced to a published source.
Married Since 2011
They met in 2001 as students at the University of St Andrews. Their engagement was announced on 16 November 2010, and they married at Westminster Abbey on 29 April 2011.
What the synastry adds
Their synastry shows two Mars in Libra, air trines between Mercury, Venus and Mars, and Saturn on her Moon. Synastry describes how two charts meet, not how a marriage is lived.
To compare your own charts, use the synastry chart, the composite chart calculator or the Davison chart calculator.
William and Catherine Synastry FAQ
›What does Prince William and Catherine’s synastry show?
Twenty-six contacts between their charts. The tightest is his Ascendant sextile her Pluto (0.67°), and both have Mars in Libra, 1.15° apart, a contact only 5.7% of random pairs share.
›What is Prince William’s birth time?
21:03 on 21 June 1982 at St Mary’s Hospital, Paddington, from the official bulletin issued that evening: “This evening at 9.03 o’clock… safely delivered of a son”.
›What is Catherine’s birth time?
It has never been released. Her chart is cast for noon on 9 January 1982 in Reading; her Moon was in Cancer all day, so the sign is certain even though the degree is not.
›What does being born in the same year change?
William was born on 21 June 1982 and Catherine on 9 January 1982, five months apart. Their slow planets therefore sit almost on top of each other, which is why this page lists only contacts with a personal point.
›What is their Davison chart?
The chart of 1 April 1982 at 04:01 UT, cast near Windsor, halfway between Paddington and Reading. Like their composite chart, it has the Sun, Moon and Mars in a T-square.
›Can I compare my chart with a partner’s the same way?
Yes. The synastry, composite and Davison calculators on this site are free and use the same engine as this page.
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Both birth charts side by side with every aspect between them.
The midpoint chart of a relationship, with its aspects and readings.
The chart of the moment and place halfway between two births.