- Ephemeris-independent runtime. After one calibration, projections use a tiny per-planet manifest; no external ephemeris thereafter.
- Deterministic and auditable. One manifest reproduces angles; bit-for-bit outputs from fixed formulas and frozen coefficients.
- Event-aware accuracy. Targets what practitioners use: rasi crossings, cusp distance, station flips.
- Parsimony by construction. Extra terms only when justified (design policy); prevents overfit.
- Time-reversible projections. Same kernel and anchor handle past and future.
- Offline, low-latency. Per-date cost is
O(#terms)trigs (orO(1)in the linear base). - Interop with SSM. Outputs drop into higher-layer SSM scoring with alignment.
- Safe-ops policy. If a query falls outside acceptance envelopes, escalate to a high-precision ephemeris only for that narrow window.
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