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  2. Unit of time - Wikipedia

    en.wikipedia.org/wiki/Unit_of_time

    Subdivisions of the day include the hour (1/24 of a day), which is further subdivided into minutes and seconds. 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. History of timekeeping devices - Wikipedia

    en.wikipedia.org/wiki/History_of_timekeeping_devices

    Early versions erred by less than one minute per day, and later ones only by 10 seconds, very accurate for their time. Dials that showed minutes and seconds became common after the increase in accuracy made possible by the pendulum clock. Brahe used clocks with minutes and seconds to observe stellar positions. [112]

  4. Decimal time - Wikipedia

    en.wikipedia.org/wiki/Decimal_time

    One décime is equal to 10 decimal minutes, which is nearly equal to a quarter-hour (15 minutes) in standard time. Thus, "five hours two décimes" equals 5.2 decimal hours, roughly 12:30 p.m. in standard time. [8] [9] One hundredth of a decimal second was a decimal tierce. [10]

  5. Binary clock - Wikipedia

    en.wikipedia.org/wiki/Binary_clock

    Reading a binary-coded decimal clock: Add the values of each column of LEDs to get six decimal digits. There are two columns each for hours, minutes and seconds. Both clocks read 12:15:45. Most common binary clocks use six columns of LEDs to represent zeros and ones.

  6. Metric time - Wikipedia

    en.wikipedia.org/wiki/Metric_time

    1.67 minutes (or 1 minute 40 seconds) 10 3: kilosecond: 1 000: 16.7 minutes (or 16 minutes and 40 seconds) 10 6: megasecond: 1 000 000: 11.6 days (or 11 days, 13 hours, 46 minutes and 40 seconds) 10 9: gigasecond: 1 000 000 000: 31.7 years (or 31 years, 252 days, 1 hour, 46 minutes, 40 seconds, assuming that there are 7 leap years in the interval)

  7. Swatch Internet Time - Wikipedia

    en.wikipedia.org/wiki/Swatch_Internet_Time

    For example, @248 BEATS indicates a time 248 .beats after midnight, or 248 ⁄ 1000 of a day (just over 5 hours and 57 minutes; or 5:57 AM UTC+1). There are no time zones in Swatch Internet Time; it is a globally unified timekeeping system based on what Swatch calls "Biel Mean Time" (BMT), the time zone conventionally known as Central European ...

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