The natal Sun target came from compute_chart_data while the solver iterates on _get_sun_lon_jd (swe sidereal flags); the frames differ by up to ~17", moving the return by up to ~7 minutes. The annual chart was also cast at the truncated minute. Ports upstream yinduzhanxing 7cc6425d / 46ed9399 (these two hunks only). PyJHora reference: 3 cases within 0.03 min. 243 public-figure annual charts: annual Lagna changes 13, year lord 11, Mudda first lord 0. v5 77 cases identical to 3c27c38e; consult goldens re-captured byte-identical. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_017eEAG8HD3mm8gsKXgk8uU8