{
  "note": "https://agereckoner.com/notes/icu-chinese-calendar/",
  "license": "https://creativecommons.org/licenses/by/4.0/",
  "generated": "2026-09-29",
  "environment": {
    "node": "v24.19.0",
    "icu": "78.3",
    "icuSourceTag": "release-78.3",
    "astronomyEngine": "2.1.19"
  },
  "span": {
    "from": "1901-02-19",
    "to": "2100-02-08",
    "days": 72674
  },
  "portCheck": {
    "newMoons": 2474,
    "monthStartsReproduced": 2474
  },
  "icuDisagreements": [
    {
      "from": "1917-03-23",
      "to": "1917-05-20",
      "days": 59,
      "hko": {
        "year": 1917,
        "month": 2,
        "leap": true,
        "day": 1
      },
      "icu": {
        "year": 1917,
        "month": 3,
        "leap": false,
        "day": 1
      },
      "verdict": "icu-astronomy-error",
      "causes": [
        {
          "event": "principal term, sun at 30°",
          "meridian": "116°25′E (Beijing)",
          "trueUtc": "1917-04-20T16:17:28Z",
          "icuUtc": "1917-04-20T15:56:57Z",
          "trueSecondsFromMidnight": 188,
          "icuSecondsFromMidnight": -183,
          "icuErrorSeconds": -1231,
          "trueLocalDay": "1917-04-21",
          "icuLocalDay": "1917-04-20"
        }
      ]
    },
    {
      "from": "1922-06-25",
      "to": "1922-08-22",
      "days": 59,
      "hko": {
        "year": 1922,
        "month": 5,
        "leap": true,
        "day": 1
      },
      "icu": {
        "year": 1922,
        "month": 6,
        "leap": false,
        "day": 1
      },
      "verdict": "icu-astronomy-error",
      "causes": [
        {
          "event": "principal term, sun at 120°",
          "meridian": "116°25′E (Beijing)",
          "trueUtc": "1922-07-23T16:19:35Z",
          "icuUtc": "1922-07-23T15:09:03Z",
          "trueSecondsFromMidnight": 315,
          "icuSecondsFromMidnight": -3057,
          "icuErrorSeconds": -4231,
          "trueLocalDay": "1922-07-24",
          "icuLocalDay": "1922-07-23"
        }
      ]
    },
    {
      "from": "1954-02-03",
      "to": "1954-03-04",
      "days": 30,
      "hko": {
        "year": 1954,
        "month": 1,
        "leap": false,
        "day": 1
      },
      "icu": {
        "year": 1953,
        "month": 12,
        "leap": false,
        "day": 30
      },
      "verdict": "icu-astronomy-error",
      "causes": [
        {
          "event": "new moon",
          "meridian": "120°E",
          "trueUtc": "1954-02-03T15:55:59Z",
          "icuUtc": "1954-02-03T16:00:18Z",
          "trueSecondsFromMidnight": -241,
          "icuSecondsFromMidnight": 18,
          "icuErrorSeconds": 259,
          "trueLocalDay": "1954-02-03",
          "icuLocalDay": "1954-02-04"
        }
      ]
    },
    {
      "from": "1955-02-22",
      "to": "1955-03-23",
      "days": 30,
      "hko": {
        "year": 1955,
        "month": 2,
        "leap": false,
        "day": 1
      },
      "icu": {
        "year": 1955,
        "month": 1,
        "leap": false,
        "day": 30
      },
      "verdict": "icu-astronomy-error",
      "causes": [
        {
          "event": "new moon",
          "meridian": "120°E",
          "trueUtc": "1955-02-22T15:54:54Z",
          "icuUtc": "1955-02-22T16:03:47Z",
          "trueSecondsFromMidnight": -306,
          "icuSecondsFromMidnight": 227,
          "icuErrorSeconds": 533,
          "trueLocalDay": "1955-02-22",
          "icuLocalDay": "1955-02-23"
        }
      ]
    },
    {
      "from": "1987-07-26",
      "to": "1987-09-22",
      "days": 59,
      "hko": {
        "year": 1987,
        "month": 6,
        "leap": true,
        "day": 1
      },
      "icu": {
        "year": 1987,
        "month": 7,
        "leap": false,
        "day": 1
      },
      "verdict": "icu-astronomy-error",
      "causes": [
        {
          "event": "principal term, sun at 150°",
          "meridian": "120°E",
          "trueUtc": "1987-08-23T16:09:56Z",
          "icuUtc": "1987-08-23T15:59:54Z",
          "trueSecondsFromMidnight": 596,
          "icuSecondsFromMidnight": -6,
          "icuErrorSeconds": -602,
          "trueLocalDay": "1987-08-24",
          "icuLocalDay": "1987-08-23"
        }
      ]
    },
    {
      "from": "1999-01-17",
      "to": "1999-02-15",
      "days": 30,
      "hko": {
        "year": 1998,
        "month": 12,
        "leap": false,
        "day": 1
      },
      "icu": {
        "year": 1998,
        "month": 11,
        "leap": false,
        "day": 30
      },
      "verdict": "icu-astronomy-error",
      "causes": [
        {
          "event": "new moon",
          "meridian": "120°E",
          "trueUtc": "1999-01-17T15:46:48Z",
          "icuUtc": "1999-01-17T16:01:26Z",
          "trueSecondsFromMidnight": -792,
          "icuSecondsFromMidnight": 86,
          "icuErrorSeconds": 878,
          "trueLocalDay": "1999-01-17",
          "icuLocalDay": "1999-01-18"
        }
      ]
    },
    {
      "from": "2012-08-17",
      "to": "2012-09-15",
      "days": 30,
      "hko": {
        "year": 2012,
        "month": 7,
        "leap": false,
        "day": 1
      },
      "icu": {
        "year": 2012,
        "month": 6,
        "leap": false,
        "day": 30
      },
      "verdict": "icu-astronomy-error",
      "causes": [
        {
          "event": "new moon",
          "meridian": "120°E",
          "trueUtc": "2012-08-17T15:55:06Z",
          "icuUtc": "2012-08-17T16:01:24Z",
          "trueSecondsFromMidnight": -294,
          "icuSecondsFromMidnight": 84,
          "icuErrorSeconds": 378,
          "trueLocalDay": "2012-08-17",
          "icuLocalDay": "2012-08-18"
        }
      ]
    },
    {
      "from": "2018-11-07",
      "to": "2018-12-06",
      "days": 30,
      "hko": {
        "year": 2018,
        "month": 9,
        "leap": false,
        "day": 30
      },
      "icu": {
        "year": 2018,
        "month": 10,
        "leap": false,
        "day": 1
      },
      "verdict": "icu-astronomy-error",
      "causes": [
        {
          "event": "new moon",
          "meridian": "120°E",
          "trueUtc": "2018-11-07T16:02:42Z",
          "icuUtc": "2018-11-07T15:54:22Z",
          "trueSecondsFromMidnight": 162,
          "icuSecondsFromMidnight": -338,
          "icuErrorSeconds": -501,
          "trueLocalDay": "2018-11-08",
          "icuLocalDay": "2018-11-07"
        }
      ]
    },
    {
      "from": "2027-02-06",
      "to": "2027-03-07",
      "days": 30,
      "hko": {
        "year": 2027,
        "month": 1,
        "leap": false,
        "day": 1
      },
      "icu": {
        "year": 2026,
        "month": 12,
        "leap": false,
        "day": 30
      },
      "verdict": "icu-astronomy-error",
      "causes": [
        {
          "event": "new moon",
          "meridian": "120°E",
          "trueUtc": "2027-02-06T15:56:47Z",
          "icuUtc": "2027-02-06T16:03:32Z",
          "trueSecondsFromMidnight": -193,
          "icuSecondsFromMidnight": 212,
          "icuErrorSeconds": 404,
          "trueLocalDay": "2027-02-06",
          "icuLocalDay": "2027-02-07"
        }
      ]
    },
    {
      "from": "2030-02-02",
      "to": "2030-03-03",
      "days": 30,
      "hko": {
        "year": 2029,
        "month": 12,
        "leap": false,
        "day": 30
      },
      "icu": {
        "year": 2030,
        "month": 1,
        "leap": false,
        "day": 1
      },
      "verdict": "icu-astronomy-error",
      "causes": [
        {
          "event": "new moon",
          "meridian": "120°E",
          "trueUtc": "2030-02-02T16:08:05Z",
          "icuUtc": "2030-02-02T15:57:07Z",
          "trueSecondsFromMidnight": 485,
          "icuSecondsFromMidnight": -173,
          "icuErrorSeconds": -658,
          "trueLocalDay": "2030-02-03",
          "icuLocalDay": "2030-02-02"
        }
      ]
    },
    {
      "from": "2057-09-28",
      "to": "2057-10-27",
      "days": 30,
      "hko": {
        "year": 2057,
        "month": 9,
        "leap": false,
        "day": 1
      },
      "icu": {
        "year": 2057,
        "month": 8,
        "leap": false,
        "day": 30
      },
      "verdict": "hko-differs-from-astronomy",
      "causes": []
    },
    {
      "from": "2070-03-12",
      "to": "2070-04-10",
      "days": 30,
      "hko": {
        "year": 2070,
        "month": 2,
        "leap": false,
        "day": 1
      },
      "icu": {
        "year": 2070,
        "month": 1,
        "leap": false,
        "day": 30
      },
      "verdict": "icu-astronomy-error",
      "causes": [
        {
          "event": "new moon",
          "meridian": "120°E",
          "trueUtc": "2070-03-12T15:52:36Z",
          "icuUtc": "2070-03-12T16:06:31Z",
          "trueSecondsFromMidnight": -444,
          "icuSecondsFromMidnight": 391,
          "icuErrorSeconds": 834,
          "trueLocalDay": "2070-03-12",
          "icuLocalDay": "2070-03-13"
        }
      ]
    }
  ],
  "movedFestivals": [
    {
      "year": 1954,
      "festival": "Lunar New Year",
      "hko": "1954-02-03",
      "icu": "1954-02-04"
    },
    {
      "year": 1954,
      "festival": "Lantern Festival",
      "hko": "1954-02-17",
      "icu": "1954-02-18"
    },
    {
      "year": 1987,
      "festival": "Qixi (Double Seventh Festival)",
      "hko": "1987-08-30",
      "icu": "1987-08-01"
    },
    {
      "year": 1987,
      "festival": "Ghost Festival",
      "hko": "1987-09-07",
      "icu": "1987-08-09"
    },
    {
      "year": 1998,
      "festival": "Laba Festival",
      "hko": "1999-01-24",
      "icu": "1999-01-25"
    },
    {
      "year": 2012,
      "festival": "Qixi (Double Seventh Festival)",
      "hko": "2012-08-23",
      "icu": "2012-08-24"
    },
    {
      "year": 2012,
      "festival": "Ghost Festival",
      "hko": "2012-08-31",
      "icu": "2012-09-01"
    },
    {
      "year": 2027,
      "festival": "Lunar New Year",
      "hko": "2027-02-06",
      "icu": "2027-02-07"
    },
    {
      "year": 2027,
      "festival": "Lantern Festival",
      "hko": "2027-02-20",
      "icu": "2027-02-21"
    },
    {
      "year": 2030,
      "festival": "Lunar New Year",
      "hko": "2030-02-03",
      "icu": "2030-02-02"
    },
    {
      "year": 2030,
      "festival": "Lantern Festival",
      "hko": "2030-02-17",
      "icu": "2030-02-16"
    },
    {
      "year": 2057,
      "festival": "Double Ninth Festival",
      "hko": "2057-10-06",
      "icu": "2057-10-07"
    }
  ],
  "icuNewMoonError": {
    "count": 2474,
    "meanMin": 1.4,
    "medianAbsMin": 4.5,
    "p90AbsMin": 11,
    "p99AbsMin": 18.4,
    "maxAbsMin": 21.9,
    "periods": [
      {
        "from": 1901,
        "to": 1950,
        "count": 618,
        "meanAbsMin": 5.7,
        "maxAbsMin": 18.9
      },
      {
        "from": 1951,
        "to": 2000,
        "count": 619,
        "meanAbsMin": 5,
        "maxAbsMin": 18.2
      },
      {
        "from": 2001,
        "to": 2050,
        "count": 618,
        "meanAbsMin": 4.9,
        "maxAbsMin": 20.3
      },
      {
        "from": 2051,
        "to": 2100,
        "count": 619,
        "meanAbsMin": 5.9,
        "maxAbsMin": 21.9
      }
    ]
  },
  "icuPrincipalTermError": {
    "count": 2400,
    "meanMin": -9.4,
    "medianAbsMin": 23.7,
    "p90AbsMin": 62.3,
    "p99AbsMin": 86.3,
    "maxAbsMin": 104.2,
    "periods": [
      {
        "from": 1901,
        "to": 1950,
        "count": 600,
        "meanAbsMin": 35.2,
        "maxAbsMin": 88
      },
      {
        "from": 1951,
        "to": 2000,
        "count": 600,
        "meanAbsMin": 13.1,
        "maxAbsMin": 43.9
      },
      {
        "from": 2001,
        "to": 2050,
        "count": 600,
        "meanAbsMin": 21.4,
        "maxAbsMin": 62.3
      },
      {
        "from": 2051,
        "to": 2100,
        "count": 600,
        "meanAbsMin": 46.5,
        "maxAbsMin": 104.2
      }
    ]
  },
  "yearlyError": [
    {
      "year": 1901,
      "newMoonMin": 2.8,
      "principalTermMin": 49.5
    },
    {
      "year": 1902,
      "newMoonMin": 4.7,
      "principalTermMin": 46.2
    },
    {
      "year": 1903,
      "newMoonMin": 6.5,
      "principalTermMin": 44.8
    },
    {
      "year": 1904,
      "newMoonMin": 8,
      "principalTermMin": 44.7
    },
    {
      "year": 1905,
      "newMoonMin": 8.1,
      "principalTermMin": 46.9
    },
    {
      "year": 1906,
      "newMoonMin": 6.4,
      "principalTermMin": 46
    },
    {
      "year": 1907,
      "newMoonMin": 8.4,
      "principalTermMin": 43.5
    },
    {
      "year": 1908,
      "newMoonMin": 6.5,
      "principalTermMin": 45.3
    },
    {
      "year": 1909,
      "newMoonMin": 3.5,
      "principalTermMin": 45.8
    },
    {
      "year": 1910,
      "newMoonMin": 3.9,
      "principalTermMin": 43.3
    },
    {
      "year": 1911,
      "newMoonMin": 5.2,
      "principalTermMin": 42.8
    },
    {
      "year": 1912,
      "newMoonMin": 6.1,
      "principalTermMin": 42.4
    },
    {
      "year": 1913,
      "newMoonMin": 8.6,
      "principalTermMin": 43.2
    },
    {
      "year": 1914,
      "newMoonMin": 7,
      "principalTermMin": 41.1
    },
    {
      "year": 1915,
      "newMoonMin": 6.2,
      "principalTermMin": 36.7
    },
    {
      "year": 1916,
      "newMoonMin": 7.3,
      "principalTermMin": 38.8
    },
    {
      "year": 1917,
      "newMoonMin": 6.4,
      "principalTermMin": 39.7
    },
    {
      "year": 1918,
      "newMoonMin": 2.6,
      "principalTermMin": 37.3
    },
    {
      "year": 1919,
      "newMoonMin": 4.3,
      "principalTermMin": 38.1
    },
    {
      "year": 1920,
      "newMoonMin": 5,
      "principalTermMin": 38.8
    },
    {
      "year": 1921,
      "newMoonMin": 6.5,
      "principalTermMin": 40.6
    },
    {
      "year": 1922,
      "newMoonMin": 7.8,
      "principalTermMin": 40
    },
    {
      "year": 1923,
      "newMoonMin": 7,
      "principalTermMin": 35.9
    },
    {
      "year": 1924,
      "newMoonMin": 6.1,
      "principalTermMin": 38.2
    },
    {
      "year": 1925,
      "newMoonMin": 7.9,
      "principalTermMin": 37.1
    },
    {
      "year": 1926,
      "newMoonMin": 5.4,
      "principalTermMin": 31.9
    },
    {
      "year": 1927,
      "newMoonMin": 3,
      "principalTermMin": 32.1
    },
    {
      "year": 1928,
      "newMoonMin": 4.5,
      "principalTermMin": 31.6
    },
    {
      "year": 1929,
      "newMoonMin": 5.2,
      "principalTermMin": 33.2
    },
    {
      "year": 1930,
      "newMoonMin": 6.2,
      "principalTermMin": 34.6
    },
    {
      "year": 1931,
      "newMoonMin": 7,
      "principalTermMin": 30.2
    },
    {
      "year": 1932,
      "newMoonMin": 7.1,
      "principalTermMin": 33.2
    },
    {
      "year": 1933,
      "newMoonMin": 5.9,
      "principalTermMin": 34.3
    },
    {
      "year": 1934,
      "newMoonMin": 6.9,
      "principalTermMin": 30.3
    },
    {
      "year": 1935,
      "newMoonMin": 5.1,
      "principalTermMin": 30.6
    },
    {
      "year": 1936,
      "newMoonMin": 2.4,
      "principalTermMin": 29.9
    },
    {
      "year": 1937,
      "newMoonMin": 5,
      "principalTermMin": 29.3
    },
    {
      "year": 1938,
      "newMoonMin": 4.5,
      "principalTermMin": 27.8
    },
    {
      "year": 1939,
      "newMoonMin": 4.6,
      "principalTermMin": 23.1
    },
    {
      "year": 1940,
      "newMoonMin": 7.3,
      "principalTermMin": 25.5
    },
    {
      "year": 1941,
      "newMoonMin": 6.2,
      "principalTermMin": 27.1
    },
    {
      "year": 1942,
      "newMoonMin": 5.5,
      "principalTermMin": 23.5
    },
    {
      "year": 1943,
      "newMoonMin": 6.2,
      "principalTermMin": 26.3
    },
    {
      "year": 1944,
      "newMoonMin": 4.8,
      "principalTermMin": 27
    },
    {
      "year": 1945,
      "newMoonMin": 3.1,
      "principalTermMin": 27.6
    },
    {
      "year": 1946,
      "newMoonMin": 5.4,
      "principalTermMin": 29.4
    },
    {
      "year": 1947,
      "newMoonMin": 4.7,
      "principalTermMin": 24.4
    },
    {
      "year": 1948,
      "newMoonMin": 5.4,
      "principalTermMin": 25.9
    },
    {
      "year": 1949,
      "newMoonMin": 6.6,
      "principalTermMin": 25.6
    },
    {
      "year": 1950,
      "newMoonMin": 5.9,
      "principalTermMin": 18.7
    },
    {
      "year": 1951,
      "newMoonMin": 5.1,
      "principalTermMin": 19.2
    },
    {
      "year": 1952,
      "newMoonMin": 6.4,
      "principalTermMin": 19.6
    },
    {
      "year": 1953,
      "newMoonMin": 4,
      "principalTermMin": 19.6
    },
    {
      "year": 1954,
      "newMoonMin": 3.8,
      "principalTermMin": 20.4
    },
    {
      "year": 1955,
      "newMoonMin": 5.5,
      "principalTermMin": 17.1
    },
    {
      "year": 1956,
      "newMoonMin": 4.6,
      "principalTermMin": 19.1
    },
    {
      "year": 1957,
      "newMoonMin": 4.9,
      "principalTermMin": 21.1
    },
    {
      "year": 1958,
      "newMoonMin": 6,
      "principalTermMin": 16.3
    },
    {
      "year": 1959,
      "newMoonMin": 6,
      "principalTermMin": 17.8
    },
    {
      "year": 1960,
      "newMoonMin": 5.5,
      "principalTermMin": 18.7
    },
    {
      "year": 1961,
      "newMoonMin": 5.9,
      "principalTermMin": 16.4
    },
    {
      "year": 1962,
      "newMoonMin": 4.7,
      "principalTermMin": 18.2
    },
    {
      "year": 1963,
      "newMoonMin": 3.6,
      "principalTermMin": 14.7
    },
    {
      "year": 1964,
      "newMoonMin": 6.1,
      "principalTermMin": 17.3
    },
    {
      "year": 1965,
      "newMoonMin": 4.7,
      "principalTermMin": 21.4
    },
    {
      "year": 1966,
      "newMoonMin": 3.9,
      "principalTermMin": 15.4
    },
    {
      "year": 1967,
      "newMoonMin": 6.4,
      "principalTermMin": 16.2
    },
    {
      "year": 1968,
      "newMoonMin": 5.6,
      "principalTermMin": 16.5
    },
    {
      "year": 1969,
      "newMoonMin": 4.7,
      "principalTermMin": 14
    },
    {
      "year": 1970,
      "newMoonMin": 5.9,
      "principalTermMin": 14.3
    },
    {
      "year": 1971,
      "newMoonMin": 3.7,
      "principalTermMin": 10
    },
    {
      "year": 1972,
      "newMoonMin": 3.9,
      "principalTermMin": 10.1
    },
    {
      "year": 1973,
      "newMoonMin": 5.4,
      "principalTermMin": 10.5
    },
    {
      "year": 1974,
      "newMoonMin": 5,
      "principalTermMin": 4.4
    },
    {
      "year": 1975,
      "newMoonMin": 3,
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    },
    {
      "year": 2023,
      "seconds": 69.2
    },
    {
      "year": 2024,
      "seconds": 69.18
    },
    {
      "year": 2025,
      "seconds": 69.14
    },
    {
      "year": 2026,
      "seconds": 69.11
    }
  ],
  "sources": {
    "hko": {
      "authority": "Hong Kong Observatory",
      "title": "Gregorian–Lunar Calendar Conversion Table",
      "url": "https://www.hko.gov.hk/en/gts/time/conversion.htm",
      "openData": "https://data.gov.hk/en/terms-and-conditions",
      "retrieved": "2026-08-18",
      "format": "Each row: [lunar year, Gregorian date of the first day of month 1, leap month number or 0, month lengths in order; a leap month follows the month it repeats]"
    },
    "nasa": [
      "https://eclipse.gsfc.nasa.gov/phase/phases1901.html",
      "https://eclipse.gsfc.nasa.gov/phase/phases2001.html"
    ],
    "nasaRead": "2026-09-29",
    "usno": "https://maia.usno.navy.mil/ser7/deltat.data",
    "usnoRead": "2026-09-29"
  },
  "repository": {
    "url": "https://github.com/esekercioglu/chinese-calendar-icu",
    "commit": "83ffe65764901437d15b4c8c2a137944e0559f8a"
  }
}