方位之间
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Direction basicsTraditional culture

Fenjin and lunar lodges: fine markings are not higher accuracy

Compiled by the Space Between editorial team5 min readContent library updated
Dense and sparse compass marks dissolving into distant stars Enlarge diagram

Dense and sparse compass marks dissolving into distant stars

Original Space Between diagram. Lines explain spatial or rule relationships; see the article for the conditions.

Distinguish fine divisions, sixty-dragon layers and the twenty-eight lodges as different types of marks and references.

A denser outer luopan ring does not make measurement more accurate. Fine subdivisions, stem-branch labels and lunar lodge names need separate explanations.

Identify the layer before its subdivisions

Fenjin refers to luopan layers assigning names and traditional attributes to finer divisions; there is no single division scheme on every plate. Luojing Toujie separately lists seventy-two dragons, sixty dragons, fenjin, Nayin and twenty-eight lodges. Similar names do not guarantee equal division counts, starting points or uses. Establish the plate design and the layer’s bounds before interpreting a small segment’s label.

Calculate an equal-division example

If a teaching plate explicitly divides a 360° circle into 120 equal parts, each part spans 3°, and five fit in a 15° mountain sector. That is simply the geometry of the stated scheme. If measurements vary across a 2° range, drawing still finer boxes does not produce more reliable directions. The number of boxes defines display resolution; measurement uncertainty comes from the device and conditions.

Lunar lodge layers have separate origins

The twenty-eight lodges began as traditional divisions of the sky, later receiving mountain and phase associations on the luopan. Luojing Toujie separately lists lodge positions, degree-related phase associations and correspondences between twenty-eight lodges and twenty-four mountains. One label cannot replace all of these. Lodge names do not imply twenty-eight equal circular segments. Check the edition’s values, origin and layer instead of inventing equal angles.

Decimal places do not create certainty

To check a fenjin result, retain at least the original angle, north reference, plate version and full layer name. Compare these inputs before comparing results across editions. If a table omits its origin or boundaries, leave a result unresolved rather than guessing a segment. These examples explain scales, not promises of wealth or health from selecting a division. Home design still depends on dimensions, daylight, circulation and construction.

Sources and further reading

These sources help clarify the concepts and their origins. Explaining a traditional term does not establish that it can predict outcomes.