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  2. Sleep Calculator: How Much Sleep Do You Need? - Healthline

    www.healthline.com/health/sleep/sleep-calculator

    Sleep guidelines by age. Birth to 3 months: 14 to 17 hours. 4 to 11 months: 12 to 16 hours. 1 to 2 years: 11 to 14 hours. 3 to 5 years: 10 to 13 hours. 6 to 12 years: 9 to 12 hours. 13 to 18 years ...

  3. This Calculator Reveals How Many Healthy Years You Have Left

    www.healthline.com/health/life-expectancy-calculator

    The Healthy Life Expectancy Calculator lists ways you can extend your “healthy years” and tells you exactly how many years it can be prolonged by. (For example, sleeping earlier could extend ...

  4. 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 ...

  5. 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 sex. Implantation of an egg, which happens after fertilization, usually takes ...

  6. How to Chart Your Cycle to Know When You Can Get Pregnant - 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 ...

  7. Equation of time - Wikipedia

    en.wikipedia.org/wiki/Equation_of_time

    The equation of time is obtained from a published table, or a graph. For dates in the past such tables are produced from historical measurements, or by calculation; for future dates, of course, tables can only be calculated. In devices such as computer-controlled heliostats the computer is often programmed to calculate the equation of time.

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