Record A
Keep its date, local time, birthplace, source type and settings together. A missing time belongs to this record—not to the other person.
Do not merge the inputs
Record B
Build the same receipt separately. Matching a couple’s current city or adding a default time does not make either record more precise.
This page’s original contribution is the split-record receipt: instead of saving only a score or a flattering label, save two independent input blocks and the one comparison question placed between them. It makes it visible when a conclusion rests on a time-sensitive field from only one person’s record.
Ask one comparison question
| Question shape | Record needed | Do not claim |
|---|---|---|
| “How do these stated placements compare?” | Visible placements and the settings that produced them. | A future outcome or proof of compatibility. |
| “What changes if one time is approximate?” | Two plausible calculations for that one record. | That the preferred version is the true one. |
| “What method is this tool using?” | The displayed calculation label and scope. | That every site’s comparison label means the same thing. |
That question-first order is intentionally different from a score-first interface: it gives the calculation a defined job and leaves real decisions with the people involved.
When the comparison should pause
Pause the chart comparison when the record is being used to decide consent, personal safety, trust, medical care, legal action or whether another person owes contact. Those are real-world questions requiring real-world evidence, communication and appropriate support—not a chart output.
For a general comparison workflow after the two receipts are ready, see the astrology compatibility calculator guide. For a rising-sign uncertainty in either record, use the find-your-rising-sign record check.
What to save from a calculator
Save the two input receipts, the visible settings, the method label, the time-status label on each record, and the exact question. A generated score alone cannot be meaningfully checked when the calculator or inputs change.
For a full single-record setup, use the find-my-birth-chart checklist; for a separate synastry-specific sequence, use the synastry chart calculator guide.
Birth-chart-compatibility questions
Do I need two birth times?
Exact times matter for time-sensitive fields. If either is unknown or approximate, keep the limitation on that person’s record and do not promote houses or angles to certainty.
Can a compatibility calculator tell me whether a relationship will work?
No. It can show a selected interpretive comparison under stated settings; it cannot establish consent, commitment, safety, communication or a future outcome.
Why do two compatibility tools disagree?
Compare their input records, time handling, visible settings and calculation labels before interpreting any different output.
What is the difference between synastry and compatibility?
Tools use labels differently. Preserve the method a page names and do not assume the labels automatically refer to an identical construction.