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  2. History of calendars - Wikipedia

    en.wikipedia.org/wiki/History_of_calendars

    While the ancient Germanic calendars were based on lunar months, the new Icelandic calendar introduced a purely solar reckoning, with a year having a fixed number of weeks (52 weeks or 364 days). This necessitated the introduction of "leap weeks" instead of the Julian leap days.

  3. History of postcards in the United States - Wikipedia

    en.wikipedia.org/wiki/History_of_postcards_in...

    Under an act passed by the U.S. Congress on February 27, 1861, privately printed cards (which weighed one ounce or less) were allowed to be sent by mail. [7] John P. Charlton copyrighted the first postcard in America that same year. [7] The rights to this card were later sold to Hymen L. Lipman, who began reissuing the cards under his name in ...

  4. Timeline of United States inventions (before 1890) - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_United_States...

    "Postal card" is the term used for a post card issued by a postal authority, generally with postage prepaid. The post card was invented by John P. Charlton of Philadelphia in 1861 for which he obtained the copyright later transferred to Hymen Lipman. The cards were adorned with a small border and labeled "Lipman's Postal Card, Patent Applied ...

  5. 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 ...

  6. Old Style and New Style dates - Wikipedia

    en.wikipedia.org/wiki/Old_Style_and_New_Style_dates

    The Gregorian calendar was implemented in Russia on 14 February 1918 by dropping the Julian dates of 1–13 February 1918, [h] pursuant to a Sovnarkom decree signed 24 January 1918 (Julian) by Vladimir Lenin. The decree required that the Julian date was to be written in parentheses after the Gregorian date, until 1 July 1918. [19]

  7. Calendar (stationery) - Wikipedia

    en.wikipedia.org/wiki/Calendar_(stationery)

    A 2007 wall calendar with moveable date marker. A calendar is used to display dates and related information, usually in a table format. Calendars are used to plan future events and keep track of appointments, and so a typical calendar will include days of the week, week numbering, months, public holidays and clock changes. [1]

  8. Postage stamps and postal history of the United States

    en.wikipedia.org/wiki/Postage_stamps_and_postal...

    Stampless letters, paid for by the receiver, and private postal systems, were gradually phased out after the introduction of adhesive postage stamps, first issued by the U.S. government post office July 1, 1847, in the denominations of five and ten cents, with the use of stamps made mandatory in 1855.

  9. Gregorian calendar - Wikipedia

    en.wikipedia.org/wiki/Gregorian_calendar

    The year used in dates during the Roman Republic and the Roman Empire was the consular year, which began on the day when consuls first entered office—probably 1 May before 222 BC, 15 March from 222 BC and 1 January from 153 BC. [44] The Julian calendar, which began in 45 BC, continued to use 1 January as the first day of the new year. Even ...