{
  "name": "Days to add to a Julian date, 1582 to 2200",
  "desc": "One row per stretch of dates that convert from Julian to Gregorian by adding the same number of days, from 10 days in 1582 to 14 days from 2100 to 2200, with the first and last dates of each stretch on both calendars and the leap day that starts it.",
  "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": [
    "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": [
    "Leap rules from the Explanatory Supplement, sec. 15.3.5 and 15.4.2 (single values); computed day by day 2026-11-01, CC BY 4.0"
  ]
}