calendar-year measurement

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• calendar year — (cal yr)    a civil unit of time, equal to 365 days or (in leap years) 366 days. See year2. In archaeology, climatology, and other sciences studying the earth over the last 40 000 years or so, a careful distinction must be made between calendar… …   Dictionary of units of measurement

• year — (a or y or yr)    1. a unit of time, defined to be the period of time required for the Earth to make one revolution around the Sun. To be more precise, the year we use in ordinary life (described in the next entry) is designed to approximate the… …   Dictionary of units of measurement

• Year — A year (from Old English gēar) is the orbital period of the Earth moving around the Sun. For an observer on Earth, this corresponds to the period it takes the Sun to complete one course throughout the zodiac along the ecliptic. In astronomy, the… …   Wikipedia

• Calendar — For other uses, see Calendar (disambiguation). For the Gregorian calendar for this year, see Common year starting on Saturday. A page from the Hindu calendar 1871–1872. A calendar is a system of organizing days for social, religious, commercial,… …   Wikipedia

• calendar — calendrical /keuh len dri keuhl/, calendric, calendarial /kal euhn dair ee euhl/, calendarian, calendaric, adj. /kal euhn deuhr/, n. 1. a table or register with the days of each month and week in a year: He marked the date on his calendar. 2. any …   Universalium

• civil year —    a year as measured by the conventional (Gregorian) calendar, equal to 365 days in most years but 366 days in a leap year. See year2. This is the same unit as the calendar year (see above). Both names are often used to specify years beginning… …   Dictionary of units of measurement

• bissextile year —    an old name for a leap year. In the Roman calendar as proclaimed by JuliusCaesar in 45 BC, the leap ( intercalary ) day in a leap year was insertednot at the end of February but after the day known as ante diem sextumKalendas Martii… …   Dictionary of units of measurement

• Gregorian year —    a unit of time equal to exactly 365.2425 days, the average length of a year in the Gregorian calendar currently used throughout the world. See year2 …   Dictionary of units of measurement

• Julian year — (a)    the average length of the year in the Julian calendar, equal to exactly 365.25 days. See year2. Astronomers use Julian years in computing the motions of planets and other bodies of the Solar System. This simplifies their calculations, but… …   Dictionary of units of measurement

• Hebrew calendar — The Hebrew calendar (הלוח העברי ha luach ha ivri), or Jewish calendar, is a lunisolar calendar used today predominantly for Jewish religious observances. It determines the dates for Jewish holidays and the appropriate public reading of Torah… …   Wikipedia

• Gregorian calendar — For the calendar of religious holidays and periods, see Liturgical year. For this year s Gregorian calendar, see Common year starting on Saturday. 2011 in other calendars Gregorian calendar 2011 MMXI …   Wikipedia