{
  "name": "Calibration card: the astronomical unit",
  "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/scale/astronomical-unit/",
  "from": [
    "BIPM, The International System of Units (SI Brochure), 9th edition, V4.01 (June 2026), Table 8 and note (j): 1 au = 149 597 870 700 m (IAU 2012 Resolution B2)",
    "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"
  ],
  "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"
  ]
}