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  2. Calendrical calculation - Wikipedia

    en.wikipedia.org/wiki/Calendrical_calculation

    A calendrical calculation is a calculation concerning calendar dates. Calendrical calculations can be considered an area of applied mathematics. Some examples of calendrical calculations: Converting a Julian or Gregorian calendar date to its Julian day number and vice versa (see § Julian day number calculation within that article for details ...

  3. Implantation Calculator: When It Happened or Will Occur

    www.healthline.com/.../implantation-calculator

    Date of ovulation + 9 days =. Date of implantation (give or take a few days) Example: Say the first day of your last period (cycle day 1) was May 2. Your cycle length is usually 30 days. This ...

  4. Old Style and New Style dates - Wikipedia

    en.wikipedia.org/wiki/Old_Style_and_New_Style_dates

    Old Style (O.S.) and New Style (N.S.) indicate dating systems before and after a calendar change, respectively. Usually, they refer to the change from the Julian calendar to the Gregorian calendar as enacted in various European countries between 1582 and 1923. In England, Wales, Ireland and Britain's American colonies, there were two calendar ...

  5. Doomsday rule - Wikipedia

    en.wikipedia.org/wiki/Doomsday_rule

    The Doomsday rule, Doomsday algorithm or Doomsday method is an algorithm of determination of the day of the week for a given date. It provides a perpetual calendar because the Gregorian calendar moves in cycles of 400 years. The algorithm for mental calculation was devised by John Conway in 1973, [1][2] drawing inspiration from Lewis Carroll 's ...

  6. Safe Period: How to Time Sex to Prevent Pregnancy - Healthline

    www.healthline.com/health/womens-health/safe-period

    An egg is viable between 12 and 24 hours after it leaves the ovary. Sperm can stay alive up to 5 days after having penis-in-vagina. Implantation of an egg, which happens after fertilization ...

  7. International Fixed Calendar - Wikipedia

    en.wikipedia.org/wiki/International_Fixed_Calendar

    The International Fixed Calendar divides the year into 13 months of 28-days each. A type of perennial calendar, every date is fixed to the same weekday every year. Though it was never officially adopted at the country level, the entrepreneur George Eastman instituted its use at the Eastman Kodak Company in 1928, where it was used until 1989. [3]

  8. Implantation Bleeding vs. Period: How to Tell the Difference

    www.healthline.com/health/implantation-bleeding...

    Implantation bleeding may last 1–3 days while your period may last 3–7 days. Sometimes timing — in addition to the symptoms above — can help you pinpoint what’s going on.

  9. Ovulation Calculator & Calendar - Determine Your Most Fertile ...

    www.webmd.com/baby/healthtool-ovulation-calculator

    Your menstrual cycle can vary from month to month, and not everyone's is the same length. Use this calculator to see when you may be ovulating to find your most fertile days. Typically, you can ...

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