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  2. Subtraction - Wikipedia

    en.wikipedia.org/wiki/Subtraction

    Placard outside a shop in Bordeaux advertising subtraction of 20% from the price of the second perfume purchased.. Subtraction (which is signified by the minus sign −) is one of the four arithmetic operations along with addition, multiplication and division.

  3. Hipparchic cycle - Wikipedia

    en.wikipedia.org/wiki/Hipparchic_cycle

    The "tritrix" eclipse cycle, [4] consisting of 1743 synodic months, 1891.496 draconic months, or 1867.9970 anomalistic months (140.925 years, equivalent to 3 inex plus 3 saros) is about as accurate as the interval of Hipparchus in terms of anomalistic months, but repeats many more times, around 20. An exceptionally accurate eclipse cycle from ...

  4. Prophetic Year - Wikipedia

    en.wikipedia.org/wiki/Prophetic_Year

    These references represent a period of 1260 days (based on the 360 day Jewish year multiplied by 3.5). [4] Divide 1,260 days by 42 months and you will get a 30-day month, as 12 months of 30 days equals 360-days in a year These time periods occur ten times in scripture: Daniel 7:25, "time, times and a half". Daniel 9:27, "half one set of seven".

  5. Let's hope they don't take it off all platforms after nine months for a second time! #13 TIL in Icelandic folklore there's a cat called Jólaköttur or Yule Cat.

  6. Table of mathematical symbols by introduction date - Wikipedia

    en.wikipedia.org/wiki/Table_of_mathematical...

    unstrict inequality signs (less-than or equals to sign and greater-than or equals to sign) : 1670 (with the horizontal bar over the inequality sign, rather than below it) ...

  7. Countdown - Wikipedia

    en.wikipedia.org/wiki/Countdown

    In the context of a rocket launch, the "L minus Time" is the physical time before launch, e.g. "L minus 3 minutes and 40 seconds". "T minus Time" is a system to mark points at which actions necessary for the launch are planned - this time stops and starts as various hold points are entered, and so doesn't show the actual time to launch.

  8. Egyptian calendar - Wikipedia

    en.wikipedia.org/wiki/Egyptian_calendar

    The Nile flood at Cairo c. 1830.. Current understanding of the earliest development of the Egyptian calendar remains speculative. A tablet from the reign of the First Dynasty pharaoh Djer (c. 3000 BC) was once thought to indicate that the Egyptians had already established a link between the heliacal rising of Sirius (Ancient Egyptian: Spdt or Sopdet, "Triangle"; Ancient Greek: Σῶθις ...

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

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

    A common exception is a series of values: The distances were 1 + 1 ⁄ 4, 2 ⁄ 3 and 1 ⁄ 2 mile, respectively. Mixed numbers may be given in figures or words (perhaps applying the guidance above to the integer part). If given in figures, they are unspaced (not Platform 9 3 ⁄ 4 or Platform 9-3 ⁄ 4 but Platform 9 + 3 ⁄ 4 (markup: {{frac ...