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Years before AD 1 are abbreviated BC for Before Christ or alternatively BCE for Before the Common Era.
Year numbers are based on inclusive counting, so that there is no "year zero".
In some languages, it is common to count years by referencing to one season, as in "summers", or "winters", or "harvests".
The word year is also used for periods loosely associated with, but not identical to, the calendar or astronomical year, such as the seasonal year, the fiscal year, the academic year, etc.
In tropical and subtropical regions, several geographical sectors do not present defined seasons; but in the seasonal tropics, the annual wet and dry seasons are recognized and tracked.
A calendar year is an approximation of the number of days of the Earth's orbital period as counted in a given calendar.
It is estimated that by the year 4000 CE, the northward equinox will fall back by one day in the Gregorian calendar, not because of this difference, but due to the slowing of the Earth's rotation and the associated lengthening of the day.
Historically, lunisolar calendars intercalated entire leap months on an observational basis.