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  2. Solar calendar - Wikipedia

    en.wikipedia.org/wiki/Solar_calendar

    The Islamic calendar is a purely lunar calendar and has a year, whose start drifts through the seasons and so is not a solar calendar. The Maya Tzolkin calendar, which follows a 260-day cycle, has no year, therefore it is not a solar calendar. Also, any calendar synchronized only to the synodic period of Venus would not be solar.

  3. History of calendars - Wikipedia

    en.wikipedia.org/wiki/History_of_calendars

    The ancient Athenian calendar was a lunisolar calendar with 354-day years, consisting of twelve months of alternating length of 29 or 30 days. To keep the calendar in line with the solar year of 365.242189 days, an extra, intercalary month was added in the years: 3, 6, 8, 11, 14, 17, 19 of the 19-years Metonic cycle.

  4. Gregorian calendar - Wikipedia

    en.wikipedia.org/wiki/Gregorian_calendar

    The Gregorian calendar, like the Julian calendar, is a solar calendar with 12 months of 28–31 days each. The year in both calendars consists of 365 days, with a leap day being added to February in the leap years .

  5. List of calendars - Wikipedia

    en.wikipedia.org/wiki/List_of_calendars

    Solar calendar with 13 months of 28 days. Badí‘ calendar: solar: Baháʼí: 1873: Baháʼí: Uses a year of 19 months of 19 days each and a 1844 era. Also known as the "Baháʼí Calendar" or the "Wondrous Calendar". Thai solar calendar: solar: Gregorian: 1888: Thailand: The Gregorian calendar but using the Buddhist Era (543 BC) Invariable ...

  6. Scientists Found a 12,000-Year-Old Monument—Turns Out It May ...

    www.aol.com/lifestyle/scientists-found-12-000...

    Carvings on a 12,000-year-old monument in Turkey appear to mark solar days and years, making it possibly the oldest solar calendar in ancient civilization.

  7. Egyptian calendar - Wikipedia

    en.wikipedia.org/wiki/Egyptian_calendar

    The ancient Egyptian calendar – a civil calendar – was a solar calendar with a 365-day year. The year consisted of three seasons of 120 days each, plus an intercalary month of five epagomenal days treated as outside of the year proper. Each season was divided into four months of 30 days.

  8. Stonehenge may have been an ancient solar calendar, a new ...

    www.aol.com/news/stonehenge-may-ancient-solar...

    Stonehenge may have served as a calendar to keep track of the yearly movements of the sun, suggesting a prehistoric link to sun worship in the eastern Mediterra

  9. Why do we have Leap Day? What to know about the science ... - AOL

    www.aol.com/why-leap-day-know-science-121311322.html

    The Julian calendar began officially on Jan. 1 in 45 BCE and continued to be used until the 16th century when the slightly overestimated solar calendar had caused major dates like Easter to change.