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  2. 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.

  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. 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 ...

  5. How Much Deep, Light, and REM Sleep Do You Need? - Healthline

    www.healthline.com/health/how-much-deep-sleep-do...

    Most adults need around 1.5–2 hours of deep sleep per night. The Centers for Disease Control and Prevention (CDC) advise adults aged 18–60 years to aim for at least 7 hours of sleep per night ...

  6. Doubling time - Wikipedia

    en.wikipedia.org/wiki/Doubling_time

    The doubling time is the time it takes for a population to double in size/value. It is applied to population growth, inflation, resource extraction, consumption of goods, compound interest, the volume of malignant tumours, and many other things that tend to grow over time. When the relative growth rate (not the absolute growth rate) is constant ...

  7. 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 ...

  8. ISO 8601 - Wikipedia

    en.wikipedia.org/wiki/ISO_8601

    t. e. ISO 8601 is an international standard covering the worldwide exchange and communication of date and time -related data. It is maintained by the International Organization for Standardization (ISO) and was first published in 1988, with updates in 1991, 2000, 2004, and 2019, and an amendment in 2022. [1]

  9. 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 ...

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