Roman calendar

The Roman calendar changed its form several times between the founding of Rome and the fall of the Roman Empire. The common calendar widely used today is known as the Gregorian calendar and is a refinement of the Julian calendar where the length of the year has been adjusted from 365.25 days to 365.2425 days (a 0.002% change).

From at least the period of Augustus on, calendars were often inscribed in stone and displayed publicly. Such calendars are called fasti.

History

The original Roman calendar is believed to have been a lunar calendar, which may have been based on one of the Greek lunar calendars. As the time between new moons averages 29.5 days its months were constructed to be either hollow (29 days) or full (30 days).

Calendar of Romulus

Roman writers attributed the original Roman calendar to Romulus, the mythical founder of Rome, though there is no other evidence for the existence of such a calendar and Romulus was often cited as the founder of practices whose origins were unknown to later Romans. According to these writers, Romulus' calendar had ten months with the spring equinox in the first month (likely based on the names of the last months of the year):

Calendar

A calendar is a system of organizing days for social, religious, commercial or administrative purposes. This is done by giving names to periods of time, typically days, weeks, months, and years. A date is the designation of a single, specific day within such a system. A calendar is also a physical record (often paper) of such a system. A calendar can also mean a list of planned events, such as a court calendar or a partly or fully chronological list of documents, such as a calendar of wills.

Periods in a calendar (such as years and months) are usually, though not necessarily, synchronized with the cycle of the sun or the moon. The most common type of pre-modern calendar was the lunisolar calendar, a lunar calendar that occasionally adds one intercalary month to remain synchronised with the solar year over the long term.

The calendar in most widespread use today is the Gregorian calendar, introduced in the 16th century as a modification of the Julian calendar, which was itself a modification of the ancient Roman calendar. The term calendar itself is taken from calendae, the term for the first day of the month in the Roman calendar, related to the verb calare "to call out", referring to the "calling" of the new moon when it was first seen. Latin calendarium meant "account book, register" (as accounts were settled and debts were collected on the calends of each month). The Latin term was adopted in Old French as calendier and from there in Middle English as calender by the 13th century (the spelling calendar is early modern).

Calendar (archives)

A calendar (sometimes historically spelled kalendar) is, in the context of archival science and archival publication, a descriptive list of documents. The verb to calendar means to compile or edit such a list. The word is used differently in Britain and North America with regard to the amount of detail expected: in Britain, it implies a detailed summary which can be used as a substitute for the full text; whereas in North America it implies a more basic inventory.

The term derives from a (now somewhat archaic) word meaning a list or register of any kind. Although the documents in a calendar are generally arranged in chronological order, the term has only an indirect relationship to a table of dates.

British tradition

In the British tradition, the word normally implies a full descriptive summary (often published) in which each document is the subject of a "carefully controlled, rigorously consistent précis". All significant elements in the text are recorded, so that the great majority of researchers will be spared the need to consult the originals: the completed calendar effectively becomes a substitute for the archival documents, and is often treated as a primary source in its own right. Trivial or incidental elements ("common form and unnecessary verbiage") are omitted; but all names, dates and significant statements are noted, and passages which appear to the editor to be of particular interest or importance may be quoted in full. Documents in archaic or foreign languages (particularly Latin) are normally calendared in the modern vernacular, but significant or ambiguous terms or passages may be given in the original language. A calendar is therefore less detailed or comprehensive than a series of full transcripts or translations; but considerably more detailed than an archival list or other finding aid.

Calendar (disambiguation)

A calendar is a catalogue, list or table, most commonly used for a table of days, months, years etc.

Calendar may also refer to: