{"name":"astronomy-api","version":"1.0.0","description":"Sun & Moon ephemeris API — sunrise/sunset, civil/nautical/astronomical twilight, golden & blue hour, day length, moon phase/illumination/age, moonrise/moonset, and instantaneous altitude/azimuth. NOAA solar algorithm + Meeus lunar ephemeris. Deterministic, no DB, no external calls.","usage":"Pass lat, lon, date=YYYY-MM-DD. Optional tz_offset (hours) shifts output to a fixed local time. /phase needs only date.","endpoints":{"GET /sun":"Sunrise, sunset, solar noon, twilights, golden/blue hour, day length","GET /moon":"Moon phase, illumination, age + moonrise/moonset","GET /day":"Combined sun + moon for one day","GET /phase":"Moon phase for a date (no location needed)","GET /position":"Instantaneous sun & moon altitude/azimuth at a datetime"},"example":"GET /sun?lat=37.5665&lon=126.9780&date=2026-06-21&tz_offset=9","accuracy":"~1 min for solar events, ~1° for lunar phase."}