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  2. Ovulation calculator - Healthline

    www.healthline.com/health/baby/ovulation-calculator

    Use our Ovulation Calculator to estimate your next ovulation date; simply enter the first day of your last menstrual period and the average length of your cycle. Because our tool provides you with ...

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

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

    Ovulation usually happens 14 days before your next period begins, but it can vary from month to month -- even in women with regular cycles. To get a better sense of when you’re ovulating, chart ...

  4. Perpetual calendar - Wikipedia

    en.wikipedia.org/wiki/Perpetual_calendar

    A perpetual calendar employs a table for finding which of fourteen yearly calendars to use. A table for the Gregorian calendar expresses its 400-year grand cycle: 303 common years and 97 leap years total to 146,097 days, or exactly 20,871 weeks. This cycle breaks down into one 100-year period with 25 leap years, making 36,525 days, or one day ...

  5. Conversion between Julian and Gregorian calendars - Wikipedia

    en.wikipedia.org/wiki/Conversion_between_Julian...

    No guidance is provided about conversion of dates before March 5, -500, or after February 29, 2100 (both being Julian dates). For unlisted dates, find the date in the table closest to, but earlier than, the date to be converted. Be sure to use the correct column. If converting from Julian to Gregorian, add the number from the "Difference" column.

  6. Julian day - Wikipedia

    en.wikipedia.org/wiki/Julian_day

    The Julian date (JD) of any instant is the Julian day number plus the fraction of a day since the preceding noon in Universal Time. Julian dates are expressed as a Julian day number with a decimal fraction added. [8] For example, the Julian Date for 00:30:00.0 UT January 1, 2013, is 2 456 293.520 833. [9]

  7. How to Calculate Your Due Date - Healthline

    www.healthline.com/health/pregnancy/your-due-date

    Naegele’s rule involves a simple calculation: Add seven days to the first day of your LMP and then subtract three months. For example, if your LMP was November 1, 2017: Add seven days (November ...

  8. Pregnancy Due Date Calculator - WebMD

    www.webmd.com/baby/healthtool-due-date-calculator

    Enter Your Due Date: View my calendar. Don't know your due date? Use our Due Date Calculator to find out. Enter the first day of your last period to find out when your baby will arrive.

  9. 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 ...

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