The Davison chart describes a relationship as a single thing with its own birth moment. Instead of averaging positions like the composite, it finds the exact midpoint in time and in place between two births and casts a real chart for that moment. This calculator builds that Davison chart for two people.
How the Davison Chart Is Built
The calculator takes the midpoint between the two birth dates and times, and the midpoint of the two birthplaces, then computes an ordinary chart for that combined moment and location. Because it is a genuine chart for a real instant, it has its own planetary positions and, with both birth places, its own Ascendant.
Davison Versus Composite
Both charts describe the relationship itself rather than the two partners. The composite is a mathematical blend of midpoints, while the Davison is an actual chart for a real time and place. A practical advantage of the Davison is that, being a real moment, it can be progressed and have transits read against it like any birth chart.
Reading the Davison Chart
Read it much like a natal chart for the partnership. The Davison Sun shows the core purpose of the bond and the Moon its emotional tone, while the Ascendant, when birth places are supplied, shows how the relationship presents itself to the world.
What You Need
Enter both people's birth dates, and ideally their birth times and places, for an accurate midpoint and Ascendant. The calculator returns the Davison moment and the planetary signs of the relationship chart.
Common Questions
What is a Davison chart?
It is a real chart cast for the exact midpoint in time and place between two people's births, used to describe the relationship as its own entity.
How is it different from a composite chart?
The composite averages the two charts mathematically, while the Davison is an actual chart for a real moment, so it can be progressed and receive transits.
Do I need both birth times and places?
Birth times and places give the most accurate midpoint and an Ascendant for the relationship; without them the planetary signs are still calculated.
Positions are computed with the Swiss Ephemeris. Astrological interpretations are traditional and are offered for reflection and entertainment, not as guaranteed predictions.
Related tools
Curious to go further? Try these astrology calculators next: Lunar Return Calculator, Harmonic Chart Calculator, Nakshatra Finder and Tithi Calculator. Used alongside each other they complement this tool nicely and help fill in the gaps. See everything in this tradition on the astrology calculators page, or head to the full calculator hub.