{
  "generatedAt": "2026-09-18T19:16:01.385Z",
  "input": {
    "date": "1991-09-06",
    "time": "18:30",
    "latitude": 50.4501,
    "longitude": 30.5234,
    "placeName": "Kyiv, Ukraine",
    "timezoneId": "Europe/Kyiv"
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  "engine": {
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    "flags": "SEFLG_SWIEPH | SEFLG_SPEED",
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    "ephemeris": "DE441, JPL#171, JPL#48, JPL#74, JPL#144, JPL#36",
    "observer": "500@399 (geocentre)",
    "quantity": "31: observer-centred ecliptic-of-date longitude of the apparent position",
    "timeScale": "UT, the Julian Day above"
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