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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. How to Figure Out How Much Sleep Is Right for You - Healthline

    www.healthline.com/health/sleep/how-to-figure...

    your wakeup time. whether you were able to complete five to six sleep cycles, or whether they were interrupted (each take about 90 minutes) the time you fall asleep, and how long that takes from ...

  4. 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.

  5. 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 ...

  6. 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 ...

  7. Unit of time - Wikipedia

    en.wikipedia.org/wiki/Unit_of_time

    A unit of time is any particular time interval, used as a standard way of measuring or expressing duration. The base unit of time in the International System of Units (SI), and by extension most of the Western world, is the second, defined as about 9 billion oscillations of the caesium atom. The exact modern SI definition is " [The second] is ...

  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. Time zone - Wikipedia

    en.wikipedia.org/wiki/Time_zone

    Time zones of the world. A time zone is an area which observes a uniform standard time for legal, commercial and social purposes. Time zones tend to follow the boundaries between countries and their subdivisions instead of strictly following longitude, because it is convenient for areas in frequent communication to keep the same time.

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