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History is the study of the past, focused on human activity and leading up to the present day. This study is facilitated by the formation of a 'true discourse of past'. The modern discipline of History is dedicated to the institutional production of this discourse. More precisely, history is the continuous, systematic narrative and research of past events as relating to the human race; as well as the study of all events in time, in relation to humanity. Those who study it as a profession are called historians. This emphasis on the 'human' has made human subjects central to the narratives of the classical discourse of modern history. Consequently, history has assumed a sense which is broader than being solely the true narratives of human past. History is not just the past as an object of systematic knowledge or the discipline that produces knowledge out of that object; history also carries a sense that is implicit in the expression 'making history'.
Thus History often signifies the production of events having transformative potentials that ushers in the future.
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A calendar is a system of organising days for a socially, religious, commercially or administratively useful purpose. This organisation is done by giving names to periods of time - typically days, weeks, months and years. The name given to each day is known as a date. Periods in a calendar (such as years and months) are usually, though not necessarily, synchronised with the cycles of some astronomical phenomenon, such as the cycle of the sun, or the moon.
Many civilisations and societies have devised a calendar, usually derived from other calendars on which they model their systems, suited to their particular needs.
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).
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