Calendar Wallpapers

Calendar: photo wallpapers: A calendar is a system for naming periods of time, typically days. These names are known as calendar dates. Cycles in a calendar are often synchronised with the perceived motion of astronomical objects. A calendar is also a physical device (often paper). This is the most common usage of the word. Other similar types of calendars can include computerised systems, which can be set to remind the user of upcoming events and appointments. As a subset, 'calendar' is also used to denote a list of particular set of planned events (for example, court calendar).[br]Calendar systems: A full calendar system has a different calendar date for every day. Thus the week cycle is by itself not a full calendar system; neither is a system to name the days within a year without a system for identifying the years. The simplest calendar system just counts days from a reference day. This applies for the Julian day. Virtually the only possible variation is using a different reference day, in particular one less distant in the past to make the numbers smaller. Computations in these systems are just a matter of addition and subtraction. Other calendars have one, or, more commonly, multiple larger units of time.[br]Calendars that contain one level of cycles:[br] - week and weekday - this system (without year, the week number keeps on increasing) is not very common[br] - year and ordinal date within the year, e.g. the ISO 8601 ordinal date system[br]Calendars with two levels of cycles:[br] - year, month, and day - most systems, including the Gregorian calendar (and its very similar predecessor, the Julian calendar), the Islamic calendar, and the Hebrew calendar[br] - year, week, and weekday - e.g. the ISO week date[br][br]

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