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The history of calendars covers practices with ancient roots as people created and used various methods to keep track of days and larger divisions of time. Calendars commonly serve both cultural and practical purposes and are often connected to astronomy and agriculture . Archeologists have reconstructed methods of timekeeping that go back to ...
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.
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 ...
Different desk pads have specific uses, for example Chinese calligraphy uses a black velour desk pad since Chinese calligraphy is written using an ink brush.Westerners use simpler writing pads with disposable paper surfaces that can be used for writing, note taking, and scribbling, often these pads are pre-printed with calendar pages, however desk pads made of material (often leather) which ...
One-time pad. A format of one-time pad used by the U.S. National Security Agency, code named DIANA. The table on the right is an aid for converting between plaintext and ciphertext using the characters at left as the key. In cryptography, the one-time pad ( OTP) is an encryption technique that cannot be cracked, but requires the use of a single ...
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