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  2. Cosmic Calendar - Wikipedia

    en.wikipedia.org/wiki/Cosmic_Calendar

    A similar analogy used to visualize the geologic time scale and the history of life on Earth is the Geologic Calendar. A graphical view of the Cosmic Calendar, featuring the months of the year, days of December, the final minute, and the final second

  3. Names of the days of the week - Wikipedia

    en.wikipedia.org/wiki/Names_of_the_days_of_the_week

    The modern Chinese names for the days of the week are based on a simple numerical sequence. The word for "week" is followed by a number indicating the day: "Monday" is literally the "Stellar Period One"/"Cycle One", that is, the "First day of the Stellar Period/Cycle", etc.

  4. Solar cycle (calendar) - Wikipedia

    en.wikipedia.org/wiki/Solar_cycle_(calendar)

    The solar cycle is a 28-year cycle of the Julian calendar, and 400-year cycle of the Gregorian calendar with respect to the week. It occurs because leap years occur every 4 years, typically observed by adding a day to the month of February, making it February 29th. There are 7 possible days to start a leap year, making a 28-year sequence. [1]

  5. Planetary hours - Wikipedia

    en.wikipedia.org/wiki/Planetary_hours

    The planetary hours are an ancient system in which one of the seven classical planets is given rulership over each day and various parts of the day. Developed in Hellenistic astrology, it has possible roots in older Babylonian astrology, and it is the origin of the names of the days of the week as used in English and numerous other languages.

  6. Day length fluctuations - Wikipedia

    en.wikipedia.org/wiki/Day_length_fluctuations

    The length of the day (LOD), which has increased over the long term of Earth's history due to tidal effects, is also subject to fluctuations on a shorter scale of time. Exact measurements of time by atomic clocks and satellite laser ranging have revealed that the LOD is subject to a number of different changes.

  7. 13 Surprising Earth Day Facts That Most People Don't Know - AOL

    www.aol.com/13-surprising-earth-day-facts...

    While Earth Day is always on April 22, EarthDay.org creates a new theme each year. This year, the theme is Planet vs. Plastics, with a goal of reducing plastic consumption 60% by 2040. Earth Day ...

  8. Calendar year - Wikipedia

    en.wikipedia.org/wiki/Calendar_year

    With 97 leap years every 400 years, the year has an average length of 365.2425 days. Other formula-based calendars can have lengths which are further out of step with the solar cycle: for example, the Julian calendar has an average length of 365.25 days, and the Hebrew calendar has an average length of 365.2468

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