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  2. Decimal calendar - Wikipedia

    en.wikipedia.org/wiki/Decimal_calendar

    A decimal calendar is a calendar which includes units of time based on the decimal system. For example, a "decimal month" would consist of a year with 10 months and 36.52422 days per month. For example, a "decimal month" would consist of a year with 10 months and 36.52422 days per month.

  3. Decimal time - Wikipedia

    en.wikipedia.org/wiki/Decimal_time

    Length of a decimal year. Since there are about 365 days in a year, there are about ⁠ 365 / 10 ⁠ = 36.5 days in a tenth of a year. Hence the year 2020.5 represents the day 2 July 2020. [22] More exactly, a "Julian year" is exactly 365.25 days long, so a tenth of the year is 36.525 days (36 days, 12 hours, 36 minutes).

  4. Year - Wikipedia

    en.wikipedia.org/wiki/Year

    A calendar year is an approximation of the number of days of the Earth's orbital period, as counted in a given calendar.The Gregorian calendar, or modern calendar, presents its calendar year to be either a common year of 365 days or a leap year of 366 days, as do the Julian calendars.

  5. Astronomical year numbering - Wikipedia

    en.wikipedia.org/wiki/Astronomical_year_numbering

    There is a disagreement between astronomers and historians about how to count the years preceding year 1. In [Astronomical Algorithms], the 'B.C.' years are counted astronomically. Thus, the year before the year +1 is the year zero, and the year preceding the latter is the year −1. The year which historians call 585 B.C. is actually the year ...

  6. Calendar year - Wikipedia

    en.wikipedia.org/wiki/Calendar_year

    A calendar year begins on the New Year's Day of the given calendar system and ends on the day before the following New Year's Day, and thus consists of a whole number of days. The Gregorian calendar year, which is in use as civil calendar in most of the world, begins on January 1 and ends on December 31 . [ 1 ]

  7. Wikipedia:Manual of Style/Dates and numbers - Wikipedia

    en.wikipedia.org/wiki/Wikipedia:Manual_of_Style/...

    Digits are grouped both sides of the decimal point (e.g. 6 543 210.123 456; 520.012 34 °C; ⁠ 101 325 / 760 ⁠). Digits are generally grouped into threes. Right of the decimal point, usual practice is to have a final group of four in preference to leaving an "orphaned" digit at the end (99.123 4567, but 99.123 456 7 would also be

  8. Metric prefix - Wikipedia

    en.wikipedia.org/wiki/Metric_prefix

    For long-scale scientific work, particularly in astronomy, the Julian year or annum (a) is a standardised variant of the year, equal to exactly 31 557 600 seconds (⁠365 + 1 / 4 ⁠ days). The unit is so named because it was the average length of a year in the Julian calendar.

  9. Number - Wikipedia

    en.wikipedia.org/wiki/Number

    Each digit to the right of the decimal point has a place value one-tenth of the place value of the digit to its left. For example, 123.456 represents ⁠ 123456 / 1000 ⁠ , or, in words, one hundred, two tens, three ones, four tenths, five hundredths, and six thousandths.