Luopan Precision Rings (宿度、分金、先天卦、爻位)
This reference module groups the corrected WS-Luopan precision rings that operate below the ordinary 24-Mountain resolution. They are not interchangeable with the basic Luopan guide: each ring answers a narrower measurement question and depends on stable compass calibration before interpretation begins.
Twenty-Eight Mansion True Degrees
The 28 mansion true-degree ring uses the Eastern Han Yongyuan 15 yellow-path table, whose raw mansion degrees total 365.25. The implementation scales those unequal spans onto the 360-degree compass while preserving the historical proportional widths. This differs from a simple equal 28-sector mansion wheel and should be used as an astronomical reference layer.
Earth Plate 240 Fenjin
The Earth Plate 240 divisions are 24 mountains multiplied by ten 1.5-degree sub-divisions. The corrected labels describe qi-share between neighboring mountains, such as five-five, six-four, seven-three, eight-two, and nine-one shares, instead of treating each division as a generic stem-branch placeholder. This makes the ring a fine directional grading tool rather than a second Jiazi cycle.
Pre-Heaven 64 Hexagrams
The Pre-Heaven 64-hexagram ring follows the Fu Xi circular compass order. The north seam is Kun/Fu (坤/復) and the south seam is Qian/Gou (乾/姤), giving each hexagram 5.625 degrees. This makes the ring suitable for Xuan Kong Da Gua and other 64-hexagram compass work that depends on the Pre-Heaven ordering.
384 Yao Divisions
The 384-yao ring expands the corrected 64-hexagram sequence into six bottom-to-top lines per hexagram: first, second, third, fourth, fifth, and top yao. Each yao occupies 0.9375 degrees, so this layer should be read only where the measurement and use case justify sub-degree precision.