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  2. Equation of time - Wikipedia

    en.wikipedia.org/wiki/Equation_of_time

    Its value is 0, 1, or 2 at different times of the year. Subtracting it leaves a small positive or negative fractional number of half turns, which is multiplied by 720, the number of minutes (12 hours) that the Earth takes to rotate one half turn relative to the Sun, to get the equation of time.

  3. Leap second - Wikipedia

    en.wikipedia.org/wiki/Leap_second

    Screenshot of the UTC clock from time.gov during the leap second on 31 December 2016.. A leap second is a one-second adjustment that is occasionally applied to Coordinated Universal Time (UTC), to accommodate the difference between precise time (International Atomic Time (TAI), as measured by atomic clocks) and imprecise observed solar time (), which varies due to irregularities and long-term ...

  4. 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 ...

  5. Metric time - Wikipedia

    en.wikipedia.org/wiki/Metric_time

    Time. Metric time is the measure of time intervals using the metric system. The modern SI system defines the second as the base unit of time, and forms multiples and submultiples with metric prefixes such as kiloseconds and milliseconds. Other units of timeminute, hour, and day – are accepted for use with SI, but are not part of it.

  6. 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 ...

  7. Timekeeping on Mars - Wikipedia

    en.wikipedia.org/wiki/Timekeeping_on_Mars

    The corresponding values for Earth are currently 23 h 56 m 4.0916 s and 24 h 00 m 00.002 s, respectively, which yields a conversion factor of 1.027 491 2517 Earth days/sol: thus, Mars's solar day is only about 2.75% longer than Earth's. The term "sol" is used by planetary scientists to refer to the duration of a solar day on Mars.

  8. Prothrombin Time (PT/INR) Blood Test for Clotting Time - WebMD

    www.webmd.com/a-to-z-guides/prothrombin-time

    A typical PT result is 10 to 14 seconds. Higher than that means your blood is taking longer than normal to clot and may be a sign of many conditions, including: Bleeding or clotting disorder. Lack ...

  9. Average Walking Speed: Pace, and Comparisons by Age and Sex

    www.healthline.com/health/exercise-fitness/...

    This averages out to a difference of 1.2 minutes slower for every kilometer (.62 mile) at age 60 than at age 20. ... a person will have walked about 75,000 miles by the time they turn 80 ...