{
  "name": "One Gregorian cycle, 2001–2400",
  "desc": "Every year of one 400-year Gregorian cycle (146,097 days = 20,871 weeks), with the three divisibility checks, the Gregorian and Julian leap-year calls, the year length, and the weekdays of January 1 and February 29.",
  "lic": "CC BY 4.0",
  "lic_url": "https://creativecommons.org/licenses/by/4.0/",
  "by": "The Yardstick Almanac",
  "url": "https://theyardstickalmanac.com/calendars/gregorian-leap-year-rule/",
  "from": [
    "Gregorian and Julian leap-year rules, Explanatory Supplement to the Astronomical Almanac, ch. 15, sec. 15.4.2 and 15.3.5"
  ],
  "how": "Compiled by The Yardstick Almanac from the data listed",
  "data_by": [
    "Computed from the Gregorian and Julian leap-year rules (Explanatory Supplement to the Astronomical Almanac, ch. 15, sec. 15.4.2 and 15.3.5), 2026-11-01, CC BY 4.0"
  ]
}