A relationship chart starts with two people, not a verdict. Synastry keeps each birth chart separate and measures the contacts between them. A midpoint composite creates a third, derived set of positions. Both can support reflection about a friendship, family bond, working partnership, or romance; neither tells you what someone will do next.
Choose the question before the chart
What birth details do you have?
| Recorded details | Reasonable starting point | Hold back |
|---|---|---|
| Both dates, times, and birthplaces | Check each natal chart, then compare cross-aspects. If the locations and historical offsets are trustworthy, examine angles and houses. | A single contact presented as a personality diagnosis. |
| Dates only, or one uncertain hour | Compare time-stable planetary positions. Test the Moon over its possible daily range. | Exact Ascendants, house overlays, and confident near-cutoff lunar contacts. |
| Only Sun signs | Use the sign reference as a light introduction. | Claims about detailed synastry or the other person's intentions. |
Birth-time uncertainty is not solved by typing noon and treating the resulting houses as real. If one record lacks a clock time, say so in the reading.
Synastry calculator →Clickable partner chart →House overlays →Composite + natal charts →
Browse the synastry aspect library
Our thirteen-page aspect reference contains the index and twelve focused guides for Sun–Moon, Venus–Mars, and Moon–Saturn contacts. Each guide starts from a measured angle and identifies which planet belongs to which chart. These are selected examples, not a complete inventory of possible contacts.
A useful order of reading
- Check the source of each birth record and historical time offset.
- Read each natal chart on its own, without assigning a role to either person.
- Use synastry to identify a small number of measured, relevant cross-aspects.
- Read a composite if the question concerns a pattern shared by the pair.
- Return to actual conversations and conduct. A chart cannot supply consent, safety, or compatibility by itself.
The existing chart-type primer also explains the Davison method, which calculates a chart at a derived time and place rather than averaging each planetary longitude.