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The Persian calendar, in use in Afghanistan and Iran, has its year begin at the midnight closest to the instant of the northward equinox as determined by astronomical computation (for the time zone of Tehran), as opposed to using an algorithmic system of leap years.

A fiscal year or financial year is a 12-month period used for calculating annual financial statements in businesses and other organizations.

Dates in this era are designated Anno Domini (Latin for in the year of the Lord), abbreviated AD, or the secular common era, abbreviated CE.

The year before 1 AD, or 1 CE, is designated 1 Before Christ (BC), or 1 Before the Common Era (BCE), and the year before that is 2 BC/2 BCE, etc.; hence, there was no year 0 AD/0 CE.

A calendar year is an approximation of the number of days of the Earth's orbital period as counted in a given calendar.

The Gregorian, or modern, calendar, presents its calendar year to be either a common year of 365 days or a leap year of 366 days, as do the Julian calendars; see below.

The academic year may be divided into academic terms, such as semesters or quarters.

The school year in many countries starts in August or September and ends in May, June or July.

In Israel the academic year begins around October or November, aligned with the second month of the Hebrew Calendar.

A year is the orbital period of the Earth moving in its orbit around the Sun.

Due to the Earth's axial tilt, the course of a year sees the passing of the seasons, marked by changes in weather, the hours of daylight, and, consequently, vegetation and soil fertility.

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