Sukuyo vs Moon sign: date table and lunar longitude
Sukuyo vs Moon sign compares different outputs: a declared zodiac longitude versus OpenFate’s 27-entry lunar-date table.
Overview
Keep the Moon’s coordinate frame and birth-time uncertainty visible. A possible palace span is not one calculated personal Moon position.
At a glance
- Moon sign
- A 12-sign zodiac position
- Sukuyo mansion
- A 27-entry date-table result
- Key distinction
- Position calculation versus calendar lookup
Which body and which frame?
A Moon sign concerns the Moon, not the Sun, and must specify a tropical or sidereal frame.
Sukuyo’s mansion name does not silently provide either of those longitudes.
Why time can matter
The Moon moves, so an uncertain birth instant can matter near a sign boundary.
A date-only Sukuyo input does not become an exact timestamp by assigning a default noon.
Do not compare only the names
A familiar sign name in a twelve-palace reference is not evidence that a personal Moon sign has been calculated.
Check whether the product lists possible spans or one measured position.
A useful comparison record
Save each method’s input, zodiac setting and displayed output. Mark uncertainty independently for each calculation.
This makes a difference explainable without inventing a combined result.
Interpretation remains separate
Even an accurately calculated Moon position does not by itself establish a personality claim.
The Wiki keeps astronomical or calendar facts separate from the traditions used to interpret them.
Compare boundary uncertainty correctly
If a timestamp is uncertain near a Moon-sign boundary, calculate the candidate instants under the same zodiac setting. Independently calculate the date-only Sukuyo record once for each uncertain civil date.
Uncertainty in one method should not be copied into the other, and a default noon must not be disguised as a recorded birth time.
Sources and editorial basis
- 宿曜經 · T1299 卷上卷上「分定宿直品第一」: palace span reference is not a person’s measured Moon longitude.Historical text for mansion names and calendar tables. Its table is not identical to OpenFate’s modern 27-mansion lookup; it does not establish predictive validity.
- OpenFate Sukuyo calculator and calculation conventionEditorial code check 2026-09-10, policy 1.0.0: moon-sign; policy.ts, constants.ts, engine.ts and traditional-cycles.ts. Product settings are not an independent historical authority; practical examples are OpenFate editorial applications.Product-specific input and output reference. Editorial checks also inspected policy 1.0.0 and the month-start constants on 2026-09-10; those implementation checks are not an independent traditional authority.
- Swiss Ephemeris: Sidereal Ephemerides for AstrologySwiss Ephemeris documentation §2.8.1 The problem of defining the zodiac: tropical/sidereal origins and ayanamsha; §2.1 planetary and lunar ephemerides.Technical reference for tropical/sidereal frames and ayanamsha choices. Longitude calculation and symbolic interpretation remain separate.