Positions
Planets and luminaries are listed in signs and degrees. A sign describes the chart coordinate, while the planet identifies what is being located.
Three layers appear on one wheel
Angles and houses
The Ascendant and houses depend on local time and place. A time guess cannot turn an unresolved house into a confirmed one.
This page’s original contribution is the reading order below: it separates data validation, coordinate reading and interpretation scope. A beautiful wheel invites fast conclusions; a repeatable order makes those conclusions easier to check.
Use a three-pass reading order
- Validate: date, local time, birthplace, time zone, zodiac frame and house system.
- Locate: name a planet, then its sign and degree; add its house only when the time is reliable.
- Limit: distinguish a chart description from a claim about future events or a fixed identity.
Boundary note: if two calculators disagree, compare their inputs and settings before comparing their interpretation prose. Most useful disagreements are calculation questions first.
What to do with a missing time
Keep the date-stable placements that the calculation can support, but label the Ascendant and houses as unresolved. A noon placeholder may be useful for displaying a wheel; it is not evidence for a particular horizon.
Use the Rising-sign two-result check when you have a defensible time range, and use the birth-chart input map to see which result depends on which field.
Star chart calculator questions
Is a star chart the same as a natal chart?
In common use, both can mean a chart of the sky for a birth moment. Check the calculator’s settings rather than assuming labels guarantee identical calculations.
Why do I need a city?
Place supplies the local context for angles and houses; it is not merely a profile detail.
Can I use a chart without a birth time?
Yes for carefully limited date-stable placements, but not for a settled Ascendant or house reading.
Can I use this to compare two people?
Use a separate two-chart method and keep each person’s source data distinct; see the synastry chart calculator guide.