If you compute a natal chart in the browser, the first accuracy problem is usually not the ephemeris — it is the birth time.
An hour of error moves the Ascendant and rearranges houses. Planet-in-sign labels can look stable while house stories become fiction. Treat unknown times as unknown: do not invent noon and then argue about the 10th house.
A minimal pipeline
- Collect date, time (or "unknown"), and place
- Convert to a UTC instant carefully around DST edges
- Compute positions
- Render only what the data supports
You can try a browser chart at AstralHoro natal chart when you want positions without installing desktop software.
What to show users
When time is missing, hide or clearly label house-dependent claims. Sun/Moon by sign can still be useful; angles cannot.
Top comments (0)