Calculate distinct mean and osculating lunar nodes

Current mean and distinct geometric osculating lunar nodes at a known civil instant. No coordinates, user ephemeris, chart input or URLs. Civil dates 1800–2200; timezone conversion can cross the UTC year boundary. Tropical default; optional sidereal mean P03 ayanamsa subtraction, with true-model nutation retained. Existing chart/timeline node fields are unchanged. All admitted attempts use one standard quota unit, including free plans. No practitioner sign-off is claimed.

Each admitted request reserves one monthly usage unit before route validation or engine work; failed or timed-out admitted attempts are not refunded. Do not automatically retry. Historical mode uses an explicit BCE/CE date object and UT1 conventions. Its response is the versioned historical envelope, not the modern UTC envelope. Read result for calculation fields and metadata for limits and uncertainty.