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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. 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. 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 ...

5. 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 ...

6. 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 ...

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.

8. 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.

9. Monitoring Your Heart Rate: What's Normal and When to Worry

   www.webmd.com/heart-disease/heart-failure/...

   A healthy heart rate for adults over 18 is usually between 60 and 100 beats per minute (bpm). Your number may vary. The best time to measure your resting heart rate is just after you wake up in ...