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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. 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]

  6. Time dilation - Wikipedia

    en.wikipedia.org/wiki/Time_dilation

    Time dilation. Time dilation is the difference in elapsed time as measured by two clocks, either because of a relative velocity between them ( special relativity ), or a difference in gravitational potential between their locations ( general relativity ). When unspecified, "time dilation" usually refers to the effect due to velocity.

  7. 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 ...

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