Midpoint Composite Chart Calculator
Sun, Moon and personal-planet midpoints · No sign-up
Calculate a relationship’s midpoint composite Sun, Moon, Mercury, Venus and Mars from two sets of birth details. With reliable times for both people, the preview also shows a midpoint Ascendant. Free to use, with no sign-up.
How to read a midpoint composite preview
The rows in this result belong to a new midpoint chart. They are not a list of either person’s natal placements. Start with the composite Sun and Moon, then read Mercury, Venus and Mars as separate positions; a repeated sign name does not mean the two people have identical birth charts.
A midpoint position and a synastry aspect answer different questions. A composite Venus in Libra is a position in the combined chart; one person’s Venus trine the other’s Mars is a contact between two charts. You can inspect those contacts in the synastry preview without treating either method as a relationship-success score.
This preview calculates five planetary midpoints, not a complete composite wheel. An Ascendant midpoint appears only when both birth times are known. If one time is missing, the noon estimate can change the Moon’s midpoint and the Ascendant stays hidden. Check uncertain birth details before comparing results with another calculator.
How to Calculate a Composite Chart
Create the midpoint composite chart for a relationship.
- 1. Enter the first person's birth date, time, and place
- 2. Enter the second person's birth details
- 3. See the composite Sun, Moon and personal planets, plus the composite Ascendant when both birth times are exact
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FAQ
What is a composite chart?
A midpoint composite takes each pair of corresponding placements, such as Sun with Sun, and finds their midpoint around the zodiac. Astrologers interpret the resulting chart as a picture of the relationship. This preview shows five planetary midpoints and, when both birth times are reliable, an Ascendant midpoint.
What's the difference between a composite chart and synastry?
Synastry can compare your Sun with the other person’s Moon. A midpoint composite instead combines Sun with Sun and Moon with Moon to create new positions. Keep that distinction in mind when a synastry contact and a composite placement seem to tell different stories.
Does this composite chart calculator draw a complete house wheel?
This preview shows the midpoint Sun, Moon, Mercury, Venus and Mars, plus a midpoint Ascendant when both birth times are reliable. It does not provide a complete composite house-cusp table. Do not infer twelve house positions from this preview.
How is a midpoint calculated across 0° Aries?
A midpoint is a new position between the two inputs. In an illustrative example, a Sun at 350° (20° Pisces) and one at 10° (10° Aries) produce a midpoint at 0° Aries along the shorter arc. It does not select one person’s Sun or average the two sign names. That new position belongs to the composite, not either natal chart.
Is this a Davison relationship chart calculator?
No. This tool combines corresponding planetary longitudes by midpoint. A Davison chart uses a midpoint in time and location to cast a different chart. Keep the methods separate when comparing results.
Can I calculate a composite chart without both birth times?
You can calculate provisional planetary midpoints from the two dates and birthplaces. Unknown times use local-noon estimates, so the Moon and any placement near a sign boundary need care. The Ascendant midpoint is omitted unless both birth times are supplied as known; no complete house-cusp table is produced.
Does a composite chart tell us whether a relationship will last?
No. These are calculated midpoint positions used in an astrological interpretation. They do not measure a probability of lasting together or establish that a relationship is healthy. Treat the result as a reflection aid, alongside what you know about the actual relationship.