House-boundary sensitivity
How uncertain event times and coordinates propagate into house assignment and when house statements should be withheld.
Calculation contract · released 2026-08-18
Definition
A house label is a discrete classification derived from a house system; its stability depends on the distance from relevant cusps and on input uncertainty.
Calculation procedure
Recompute the chart across the allowed time/location interval, compare house assignments, and expose only those placements stable throughout the interval.
Required inputs
- Event-time interval
- Location uncertainty
- House system
- Continuous point and cusp longitudes
Maha convention
Maha corporate reports carry event-time confidence and can withhold time-sensitive house interpretation when geometry changes across the possible interval.
Uncertainty and edge cases
Date-only evidence cannot support exact quadrant houses; even whole-sign houses become unstable if the ascendant sign changes during the interval.
What this does not establish
Selecting a preferred house from several candidates after seeing outcomes is post-hoc model selection.
Authoritative references
These sources establish the calculation vocabulary, data product, or transformation convention. They do not establish astrological interpretation.
- Swiss Ephemeris general documentation
Astrodienst AG · 2.10 documentation, checked 2026-08-18
An independent ephemeris implementation, supported reference choices, house calculations, and its dual-license boundary.
Boundary: Maha does not bundle or call Swiss Ephemeris in production. Frozen conformance results are validation evidence, not permission to redistribute its software or data.
- Time Zone Database
Internet Assigned Numbers Authority · 2026c
Versioned civil-time-zone identifiers, UTC offsets, daylight-saving transitions, and historical rules for representative locations.
Boundary: The database records civil-time practice and can contain historical uncertainty; it does not supply leap seconds or astronomical time scales.