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  2. Unit of time - Wikipedia

    en.wikipedia.org/wiki/Unit_of_time

    The second is the international standard unit (SI unit) for science. Celestial sphere -based: as in sidereal time , where the apparent movement of the stars and constellations across the sky is used to calculate the length of a year.

  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. Cosmic Calendar - Wikipedia

    en.wikipedia.org/wiki/Cosmic_Calendar

    A graphical view of the Cosmic Calendar, featuring the months of the year, days of December, the final minute, and the final second. The Cosmic Calendar is a method to visualize the chronology of the universe, scaling its currently understood age of 13.8 billion years to a single year in order to help intuit it for pedagogical purposes in science education or popular science.

  5. Orders of magnitude (time) - Wikipedia

    en.wikipedia.org/wiki/Orders_of_magnitude_(time)

    In some cases, the order of magnitude may be implied (usually 1), like a "second" or "year". In other cases, the quantity name implies the base unit, like "century". In most cases, the base unit is seconds or years. Prefixes are not usually used with a base unit of years. Therefore, it is said "a million years" instead of "a megayear".

  6. TI-30 - Wikipedia

    en.wikipedia.org/wiki/TI-30

    TI-30XA (2013): retained the size and shape of the 1996 model, having buttons rounded on the bottom, and the color of the "2nd" button changed from yellow to green. With introduction of a new circuit board in 2015 the logarithm bug was fixed, [4] also the calculator switched to using just one 1.5V battery instead of two.

  7. Graphical timeline of the Big Bang - Wikipedia

    en.wikipedia.org/wiki/Graphical_timeline_of_the...

    To convert −30 read on the scale to second calculate ... Cosmic Calendar (age of the universe scaled to a single year) Detailed logarithmic timeline; References

  8. Equation of time - Wikipedia

    en.wikipedia.org/wiki/Equation_of_time

    During a year the equation of time varies as shown on the graph; its change from one year to the next is slight. Apparent time, and the sundial, can be ahead (fast) by as much as 16 min 33 s (around 3 November), or behind (slow) by as much as 14 min 6 s (around 11 February). The equation of time has zeros near 15 April, 13 June, 1 September ...

  9. Pascal's calculator - Wikipedia

    en.wikipedia.org/wiki/Pascal's_calculator

    Pascal's calculator (also known as the arithmetic machine or Pascaline) is a mechanical calculator invented by Blaise Pascal in 1642. Pascal was led to develop a calculator by the laborious arithmetical calculations required by his father's work as the supervisor of taxes in Rouen . [ 2 ]

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