Astrology Calculation Receipt and Calculator Differences: A Source-Reviewed Guide
Agreement proves reproducible implementation under declared rules, not interpretive accuracy. Scope and limits are explicit.
Overview
A calculation receipt lists normalized inputs, timezone resolution, time scales, coordinates, ephemeris, zodiac, node, house, orb policies, versions, warnings, and outputs so two calculators can be diffed field by field. The page shows exactly what to verify, how to repeat the method, where a plausible near miss fails, which variants change the result, and what the evidence cannot establish.
At a glance
- Direct scope
- Reviewed finding — A calculation receipt is a field-by-field provenance record: original input, normalization, time conversion, coordinates, ephemeris, frame, zodiac, angles, houses, aspects, precision, warnings, version, and final outputs.
- Evidence to verify
- Method checkpoint — Align two calculators by immutable input, then compare UTC, Julian Date and scale, coordinates, ephemeris flags, raw longitudes, zodiac offset, angles, cusps, and orb tables in dependency order until the first divergence.
- Repeatable method
- Worked-case result — Two charts disagree on the Ascendant sign. Their planetary longitudes match, but one resolved an autumn fold to standard time and the other to daylight time; the receipt isolates the one-hour divergence.
- Worked example
- Failure condition — Comparing screenshots by displayed sign alone cannot locate a cause: rounding, zodiac, house system, zone, or ephemeris may differ. Re-entering values until pictures match destroys the audit trail.
- Near miss
- Documented variant — Receipts can be concise for users and expanded for auditors; privacy-safe hashes may replace retained raw data; precision tiers may differ. Both sides still need stable schemas and human-readable convention labels.
- Limits and safety
- Use boundary — Agreement proves reproducible implementation under declared rules, not interpretive accuracy. A receipt must minimize personal data, preserve uncertainty, and never invite users to choose the chart they prefer.
Definition and Scope
A calculation receipt lists normalized inputs, timezone resolution, time scales, coordinates, ephemeris, zodiac, node, house, orb policies, versions, warnings, and outputs so two calculators can be diffed field by field.
A calculation receipt is a field-by-field provenance record: original input, normalization, time conversion, coordinates, ephemeris, frame, zodiac, angles, houses, aspects, precision, warnings, version, and final outputs.
Evidence and Repeatable Method
Align two calculators by immutable input, then compare UTC, Julian Date and scale, coordinates, ephemeris flags, raw longitudes, zodiac offset, angles, cusps, and orb tables in dependency order until the first divergence.
Worked Example and Near Miss
Two charts disagree on the Ascendant sign. Their planetary longitudes match, but one resolved an autumn fold to standard time and the other to daylight time; the receipt isolates the one-hour divergence.
Comparing screenshots by displayed sign alone cannot locate a cause: rounding, zodiac, house system, zone, or ephemeris may differ. Re-entering values until pictures match destroys the audit trail.
Variants and Disagreement
Receipts can be concise for users and expanded for auditors; privacy-safe hashes may replace retained raw data; precision tiers may differ. Both sides still need stable schemas and human-readable convention labels.
Limits and Safe Use
Agreement proves reproducible implementation under declared rules, not interpretive accuracy. A receipt must minimize personal data, preserve uncertainty, and never invite users to choose the chart they prefer.
Sources and editorial basis
- Swiss Ephemeris 2.10 DocumentationSwiss Ephemeris 2.10 manual, chapters 2 “The Ephemerides”, 6 “Sidereal Time, Ascendant, MC, Houses, Vertex”, and 7 “Delta T”, pages 5–64Public technical documentation for ephemerides, time conversions, sidereal time, apparent positions, houses, nodes, and Delta T; software policy and version must still be disclosed.
- IANA Time Zone DatabaseIANA Time Zone Database sections “Latest version”, “Sources and Links”, “Theory and Pragmatics”, and “How to Read the Database” for release files, civil-time history, and data interpretationThe maintained source for current and historical civil-time offsets and daylight-saving transitions; it provides timekeeping facts, not astrological interpretation.