{
  "name": "The astronomical unit in meters, kilometers, miles and light time",
  "desc": "One astronomical unit in meters, kilometers, international miles and the light time in a vacuum, plus how far the round figures 150 million km and 93 million miles are from it. Every value follows exactly from defined constants; rounded decimals are marked.",
  "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)",
    "BIPM, SI Brochure, 9th edition, V4.01, Table 1: speed of light in vacuum c = 299 792 458 m/s, a defining constant",
    "NIST Handbook 44-2026, Appendix C: 1 mile = 1.609 344 km exactly (24 FR 5348, 1959)"
  ],
  "how": "Compiled by The Yardstick Almanac from the data listed",
  "data_by": [
    "Defined values from the BIPM SI Brochure, 9th ed. V4.01 (CC BY 4.0; adapted: values used in new calculations) and NIST Handbook 44-2026, Appendix C; computed 2026-11-01, CC BY 4.0"
  ]
}