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Calendar Systems - JSON

Calendar systems are frameworks for measuring time and determining dates. There are three main types: solar, lunar, and lunisolar calendars, each using different astronomical phenomena as reference points. Various calendar systems exist rooted in different cultures and religions worldwide, such as the Gregorian, Julian, Hijri, and Chinese calendars, and they continue to be widely used in daily life, religious observances, and agricultural activities.

calendar solar calendar lunar calendar lunisolar calendar Gregorian calendar Julian calendar Islamic calendar astronomy

[
  {
    "code": "01",
    "slug": "gregorian-calendar",
    "name": "Gregorian Calendar",
    "description": "The current international standard solar calendar.",
    "type": "Solar Calendar",
    "yearLength": 365.2425,
    "leapYearRule": "Divisible by 4, except century years not divisible by 400",
    "introduced": "1582",
    "origin": "Europe"
  },
  {
    "code": "02",
    "slug": "julian-calendar",
    "name": "Julian Calendar",
    "description": "A solar calendar established in ancient Rome.",
    "type": "Solar Calendar",
    "yearLength": 365.25,
    "leapYearRule": "Every 4 years",
    "introduced": "46 BCE",
    "origin": "Rome"
  },
  {
    "code": "03",
    "slug": "islamic-calendar",
    "name": "Hijri Calendar (Islamic Calendar)",
    "description": "A pure lunar calendar used for Islamic religious observances.",
    "type": "Lunar Calendar",
    "yearLength": 354.37,
    "leapYearRule": "None (30-year cycle with 11 leap days)",
    "introduced": "639 CE",
    "origin": "Arabia"
  },
  {
    "code": "04",
    "slug": "chinese-calendar",
    "name": "Chinese Calendar (Lunisolar)",
    "description": "A lunisolar calendar combining moon phases and solar movements.",
    "type": "Lunisolar Calendar",
    "yearLength": 354,
    "leapYearRule": "Leap month inserted 7 times per 19 years",
    "introduced": "Ancient",
    "origin": "China"
  },
  {
    "code": "05",
    "slug": "hebrew-calendar",
    "name": "Hebrew Calendar",
    "description": "A lunisolar calendar used in Judaism.",
    "type": "Lunisolar Calendar",
    "yearLength": 354,
    "leapYearRule": "7 leap months per 19 years",
    "introduced": "Ancient",
    "origin": "Middle East"
  },
  {
    "code": "06",
    "slug": "persian-calendar",
    "name": "Persian Calendar (Iranian Calendar)",
    "description": "One of the most accurate solar calendars in the world.",
    "type": "Solar Calendar",
    "yearLength": 365.242198,
    "leapYearRule": "Complex 33-year cycle",
    "introduced": "1925 (modern version)",
    "origin": "Persia (Iran)"
  },
  {
    "code": "07",
    "slug": "hindu-calendar",
    "name": "Hindu Calendar",
    "description": "A lunisolar calendar used in India with regional variations.",
    "type": "Lunisolar Calendar",
    "yearLength": 354,
    "leapYearRule": "Regional variations",
    "introduced": "Ancient",
    "origin": "India"
  },
  {
    "code": "08",
    "slug": "ethiopian-calendar",
    "name": "Ethiopian Calendar",
    "description": "A solar calendar used in Ethiopia, approximately 7-8 years behind the Gregorian calendar.",
    "type": "Solar Calendar",
    "yearLength": 365.25,
    "leapYearRule": "Every 4 years",
    "introduced": "Ancient",
    "origin": "Ethiopia"
  }
]