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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 ...
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 ...
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 ...
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 ...
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 ...
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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