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.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.No astronomical year has an integer number of days or lunar months, so any calendar that follows an astronomical year must have a system of intercalation such as leap years.Financial and scientific calculations often use a 365-day calendar to simplify daily rates.A year is the orbital period of the Earth moving in its orbit around the Sun.
The Revised Julian calendar, as used in some Eastern Orthodox Churches, currently does a better job than the Gregorian in synchronizing with the mean tropical year.
In English, the abbreviations "y" and "yr" are commonly used.
In astronomy, the Julian year is a unit of time; it is defined as 365.25 days of exactly 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.
The Greek word for "year", "yearling (calf)", the latter also reflected in Latin vitulus "bull calf", English wether "ram" (Old English weðer, Gothic wiþrus "lamb").
In some languages, it is common to count years by referencing to one season, as in "summers", or "winters", or "harvests".