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  2. Calendar year - Wikipedia

    en.wikipedia.org/wiki/Calendar_year

    The calendar year can be divided into four quarters, often abbreviated as Q1, Q2, Q3, and Q4. Since they are three months each, they are also called trimesters. In the Gregorian calendar : First quarter, Q1: January – March (90 days or 91 days in leap years) Second quarter, Q2: April – June (91 days) Third quarter, Q3: July – September ...

  3. Burmese calendar - Wikipedia

    en.wikipedia.org/wiki/Burmese_calendar

    The calendar recognises two types of day: astronomical and civil. The mean Burmese astronomical day is from midnight to midnight, and represents 1/30 of a synodic month or 23 hours, 37 minutes and 28.08 seconds. The civil day comprises two halves, the first half beginning at sunrise and the second half at sunset.

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  5. 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. 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.

  6. Pirelli Calendar - Wikipedia

    en.wikipedia.org/wiki/Pirelli_Calendar

    The Pirelli Calendar, known and trade-marked as " The Cal ", is an annual trade calendar which has been published by the UK subsidiary of the Italian tyre manufacturing company Pirelli since 1964. The calendar has a reputation for its choice of photographers and models and featured glamour photography from the 1980s until the 2010s.

  7. 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 ...