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  2. 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 ...

  3. Ovulation calculator - Healthline

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

    When this occurs, you are the most fertile. 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 ...

  4. Chinese Gender Predictor Tool: Boy or Girl? - Healthline

    www.healthline.com/health/baby/chinese-gender...

    The Chinese Gender Prediction Method makes use of the lunar calendar. By considering the month of conception and the age of the mother at conception, a formula is used to determine whether the ...

  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. Pregnancy Due Date Calculator - WebMD

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

    Due Date Calculator. Congratulations, you're pregnant! Now - when will your new baby arrive? Select the first day of your last period ...

  7. 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 ...

  8. How to Use a Menstrual Cycle Chart to Determine Fertility - WebMD

    www.webmd.com/baby/charting-your-fertility-cycle

    Day 1 is the first day of your period. Since the length of your cycle can vary slightly from month to month, it's best to keep track for a few months. Once you have an average, subtract 18 days ...

  9. Calendrical calculation - Wikipedia

    en.wikipedia.org/wiki/Calendrical_calculation

    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 ...

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