{
  "name": "The kilogram's paper trail, 1799–2019",
  "desc": "One row per document or event from the 1799 platinum kilogram to the 2019 definition: date, body, what it says about the kilogram, source, and how fully that source was read.",
  "lic": "CC BY 4.0",
  "lic_url": "https://creativecommons.org/licenses/by/4.0/",
  "by": "The Yardstick Almanac",
  "url": "https://theyardstickalmanac.com/units/kilogram-definition/",
  "from": [
    "BIPM, The International System of Units (SI), 9th edition, version 4.01 (June 2026), CC BY 4.0",
    "CGPM, 26th meeting (2018), Resolution 1, On the revision of the International System of Units (SI), in force from 20 May 2019",
    "NIST SI Redefinition web pages: Kilogram: Introduction and Kilogram: The Past"
  ],
  "how": "Compiled by The Yardstick Almanac from the data listed",
  "data_by": [
    "SI Brochure, 9th edition, version 4.01, and CGPM Resolution 1 (2018), by the BIPM, CC BY 4.0 (adapted: summarized one event per row), and NIST web pages (public domain); 2026-11-01"
  ]
}