{
  "name": "Calibration card: Old Style and New Style dates",
  "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/old-style-new-style-dates/",
  "from": [
    "Calendar (New Style) Act 1750, preamble and section 1 (legislation.gov.uk, Open Government Licence v3.0; read 2026-11-01)",
    "Explanatory Supplement to the Astronomical Almanac, ch. 15, sec. 15.1.10, 15.3.4, 15.3.5, 15.4.1, 15.4.2 (single values only; read 2026-11-01)"
  ],
  "how": "Compiled by The Yardstick Almanac from the data listed",
  "data_by": [
    "Calendar (New Style) Act 1750 (Open Government Licence v3.0) and Explanatory Supplement ch. 15 (single values); mean years computed 2026-11-01, CC BY 4.0"
  ]
}