@zodiacs/engine 1.0.0
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    Variable POLAR_FALLBACKConst

    POLAR_FALLBACK: "whole"

    The system Placidus and Koch fall back to where they are undefined. The chart then carries the polar-fallback flag. Swiss Ephemeris falls back to Porphyry there instead; ask for "porphyry" to get that system at any latitude.