{
  "name": "Calibration card: Coordinated Universal Time (UTC)",
  "desc": "The values in the Calibration card at the top of the page, one field per row, with the source of each value.",
  "lic": "CC BY 4.0",
  "lic_url": "https://creativecommons.org/licenses/by/4.0/",
  "by": "The Yardstick Almanac",
  "url": "https://theyardstickalmanac.com/calendars/leap-second/",
  "from": [
    "IERS Earth Orientation Center: Leap_Second.dat and Bulletin C issues 10, 13, 16, 30, 36, 43, 49, 52 and 72 (factual values, read 2026-11-01)",
    "BIPM, CGPM 2022 Resolution 4 (DOI 10.59161/CGPM2022RES4E; CC BY 4.0)",
    "BIPM, CGPM 2026 Resolution 5 (DOI 10.59161/CGPM2026RES5E; CC BY 4.0)"
  ],
  "how": "Compiled by The Yardstick Almanac from the data listed",
  "data_by": [
    "IERS Bulletin C 72 and Leap_Second.dat (factual values), CGPM 2022 Resolution 4 and 2026 Resolution 5 (BIPM, CC BY 4.0; adapted: values quoted in short fields); compiled 2026-11-01, CC BY 4.0"
  ]
}