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This discrepancy was largely corrected by the Gregorian reform of 1582.
Historical calendars are often grouped into larger categories by cultural sphere or historical period; thus O'Neil (1976) distinguishes the groupings Egyptian calendars (Ancient Egypt), Babylonian calendars (Ancient Mesopotamia), Indian calendars (Hindu and Buddhist traditions of the Indian subcontinent), Chinese calendars and Mesoamerican calendars.
Many modern calendar proposals, including the Gregorian calendar itself, are in turn modifications of the Julian calendar.
In the list below, specific calendars are given, listed by calendar type (solar, lunisolar or lunar), time of introduction (if known), context of use and cultural or historical grouping (if applicable).
The Julian calendar is still used in parts of the Eastern Orthodox Church, in parts of Oriental Orthodoxy and Anabaptism, The Julian calendar has two types of year: "normal" years of 365 days and "leap" years of 366 days.
There is a simple cycle of three "normal" years followed by a leap year and this pattern repeats forever without exception.