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  2. Year 2038 problem - Wikipedia

    en.wikipedia.org/wiki/Year_2038_problem

    Many computer systems measure time and date using Unix time, an international standard for digital timekeeping.Unix time is defined as the number of seconds elapsed since 00:00:00 UTC on 1 January 1970 (an arbitrarily chosen time based on the creation of the first Unix system), which has been dubbed the Unix epoch.

  3. Swatch Internet Time - Wikipedia

    en.wikipedia.org/wiki/Swatch_Internet_Time

    The time of day begins at midnight, for example, @248 BEATS would indicate a time 248 .beats after midnight, representing 248 ⁄ 1000 of a day, just over 5 hours and 57 minutes. There are no time zones in Swatch Internet Time; it is globally based on the time zone of Biel, Switzerland, where Swatch's headquarters is located, what is ...

  4. How Long Should You Wash Your Hands? Guidelines and Tips

    www.healthline.com/health/how-long-should-you...

    Scrubbing hands together for 20 or more seconds is enough to get rid of possible contaminating bacteria and viruses. ... about once every couple of minutes. This doesn’t mean you need to ...

  5. Femtosecond - Wikipedia

    en.wikipedia.org/wiki/Femtosecond

    Because the next higher SI unit is 1000 times larger, times of 10 −14 and 10 −13 seconds are typically expressed as tens or hundreds of femtoseconds. Typical time steps for molecular dynamics simulations are on the order of 1 fs. [4] The periods of the waves of visible light have a duration of about 2 femtoseconds.

  6. Time Under Tension: How to Do This Type of Strength Training

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

    Time under tension, or TUT, is a way of doing strength training exercises, where you slow down your movements. ... Usually, a strength training TUT set lasts between 30 and 60 seconds, depending ...

  7. Tropical year - Wikipedia

    en.wikipedia.org/wiki/Tropical_year

    The length of the tropical year was given as 365 solar days 5 hours 49 minutes 16 seconds (≈ 365.24255 days). This length was used in devising the Gregorian calendar of 1582. [7] In Uzbekistan, Ulugh Beg's Zij-i Sultani was published in 1437 and gave an estimate of 365 solar days 5 hours 49 minutes 15 seconds (365.242535 days). [8]

  8. Speed of light - Wikipedia

    en.wikipedia.org/wiki/Speed_of_Light

    In his 1704 book Opticks, Isaac Newton reported Rømer's calculations of the finite speed of light and gave a value of "seven or eight minutes" for the time taken for light to travel from the Sun to the Earth (the modern value is 8 minutes 19 seconds). [145] Newton queried whether Rømer's eclipse shadows were coloured.

  9. Longitude by chronometer - Wikipedia

    en.wikipedia.org/wiki/Longitude_by_chronometer

    Consequently, noon at the Prime Meridian is rarely if ever exactly at 12:00 UTC, but rather it occurs some minutes and seconds before or after that time each day. This slight daily variation has been calculated and is listed for each day of the year in the Nautical almanac [4] under the title of Equation of time. This variation must be added to ...

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