{
  "name": "Measured or exact: the au, electronvolt and dalton in 2008 and 2026",
  "desc": "How NIST SP 811 (2008) and the SI Brochure version 4.01 (2026) list the astronomical unit, the electronvolt and the dalton: value in SI units, measured or exact, and the standard uncertainty where one is given. One document entry per row.",
  "lic": "CC BY 4.0",
  "lic_url": "https://creativecommons.org/licenses/by/4.0/",
  "by": "The Yardstick Almanac",
  "url": "https://theyardstickalmanac.com/scale/astronomical-unit/",
  "from": [
    "NIST Special Publication 811, 2008 edition, sec. 5.1.2 and Table 7 notes (a)–(c): astronomical unit, electronvolt and unified atomic mass unit with their values and standard uncertainties",
    "BIPM, SI Brochure, 9th edition, V4.01, Table 8 and notes (i), (j), (l): astronomical unit, electronvolt and dalton entries"
  ],
  "how": "Compiled by The Yardstick Almanac from the data listed",
  "data_by": [
    "Entries from NIST SP 811 (2008) and the BIPM SI Brochure, 9th ed. V4.01 (CC BY 4.0; adapted: three Table 8 rows restated with their notes); compiled 2026-11-01, CC BY 4.0"
  ]
}