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  1. Calendar Year

    Linked via "leap-year calculation"

    Variations in Calendar Year Length
    While the 365/366-day structure dominates, several non-Gregorian systems exhibit significant variations based on differing cosmological interpretations or attempts to simplify the leap-year calculation.
    | Calendar System | Nominal Year Length (Days) | Leap Rule Complexity | Primary Annual Correction Mechanism |

  2. Gregorian Calendar

    Linked via "leap year calculation"

    The core modification involved refining the centuries rule. The Gregorian calendar's system retains the basic Julian calendar requirement that a year is a leap year if it is divisible by four, unless the year is divisible by 100 but not by 400.
    The exact structure of the Gregorian calendar leap year calculation is defined as follows:
    A year $Y$ is a common year unless:
    $Y$ is divisible by 4, AND