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2. Perpetual calendar - Wikipedia

   en.wikipedia.org/wiki/Perpetual_calendar

   A perpetual calendar employs a table for finding which of fourteen yearly calendars to use. A table for the Gregorian calendar expresses its 400-year grand cycle: 303 common years and 97 leap years total to 146,097 days, or exactly 20,871 weeks. This cycle breaks down into one 100-year period with 25 leap years, making 36,525 days, or one day ...

3. History of calendars - Wikipedia

   en.wikipedia.org/wiki/History_of_calendars

   In 2013, archaeologists unearthed ancient evidence of a 10,000-year-old calendar system in Warren Field, Aberdeenshire. [2] This calendar is the next earliest, or "the first Scottish calendar". The Sumerian calendar was the next earliest, followed by the Egyptian, Assyrian and Elamite calendars. The Vikram Samvat has been used by Hindus and Sikhs.

4. List of calendars - Wikipedia

   en.wikipedia.org/wiki/List_of_calendars

   This is a list of calendars.Included are historical calendars as well as proposed ones. Historical calendars are often grouped into larger categories by cultural sphere or historical period; thus O'Neil (1976) distinguishes the groupings Egyptian calendars (Ancient Egypt), Babylonian calendars (Ancient Mesopotamia), Indian calendars (Hindu and Buddhist traditions of the Indian subcontinent ...

5. Calendar - Wikipedia

   en.wikipedia.org/wiki/Calendar

   A calendar is a system of organizing days. This is done by giving names to periods of time, typically days, weeks, months and years. [ 1 ][ 2 ][ 3 ] A date is the designation of a single and specific day within such a system. A calendar is also a physical record (often paper) of such a system.

6. Roman calendar - Wikipedia

   en.wikipedia.org/wiki/Roman_calendar

   Roman calendar. The Roman calendar was the calendar used by the Roman Kingdom and Roman Republic. Although the term is primarily used for Rome's pre-Julian calendars, it is often used inclusively of the Julian calendar established by the reforms of the Dictator Julius Caesar and Emperor Augustus in the late 1st century BC.

7. Annual calendar - Wikipedia

   en.wikipedia.org/wiki/Annual_calendar

   Annual calendar. An annual calendar is a representation of the year that expires with the year represented, or that must be altered annually to remain current. The term takes different but related meanings across two contexts. One is for static (synchronic) calendars, such as wall calendars or calendar systems.