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  2. Sidereal time - Wikipedia

    en.wikipedia.org/wiki/Sidereal_time

    Animation showing the difference between a sidereal day and a solar day. Sidereal time ("sidereal" pronounced / saɪˈdɪəriəl, sə -/ sy-DEER-ee-əl, sə-) is a system of timekeeping used especially by astronomers. Using sidereal time and the celestial coordinate system, it is easy to locate the positions of celestial objects in the night sky.

  3. 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 ...

  4. Minute and second of arc - Wikipedia

    en.wikipedia.org/wiki/Minute_and_second_of_arc

    A minute of arc is π10 800 of a radian . A second of arc, arcsecond (arcsec), or arc second, denoted by the symbol ″, [2] is 1 60 of an arcminute, 1 3600 of a degree, [1] 1 1 296 000 of a turn, and π648 000 (about 1 206 264.8) of a radian. These units originated in Babylonian astronomy as sexagesimal (base 60) subdivisions of the degree ...

  5. 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 ...

  6. What Is VO2 Max? The Value of This Fitness Measurement - WebMD

    www.webmd.com/fitness-exercise/what-to-know...

    It's measured in liters per minute. Relative: Relative VO2 max is the amount of oxygen you inhale relative to your weight. It's measured in milliliters per kilogram. Both are a good way to measure ...

  7. Pace. Tips to get faster. Getting prepared. Takeaway. If you run a mile about every 8 minutes, you can count on your 5K time being under or around 25 minutes. But beginners may aim to run a mile ...

  8. Second - Wikipedia

    en.wikipedia.org/wiki/Second

    Second. The second (symbol: s) is the unit of time in the International System of Units (SI), historically defined as of a day – this factor derived from the division of the day first into 24 hours, then to 60 minutes and finally to 60 seconds each (24 × 60 × 60 = 86400).

  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 ...

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