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  2. Cosmic Calendar - Wikipedia

    en.wikipedia.org/wiki/Cosmic_Calendar

    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. In this visualization, the Big Bang took place at the beginning of January 1 at midnight, and the ...

  3. Hours of service - Wikipedia

    en.wikipedia.org/wiki/Hours_of_service

    The 34 hour restart provision will still be in effect. However, drivers will only be allowed 1 restart per week (168 hours). Up to 2 hours either side of a sleeper-berth period while in the passenger seat will count as off-duty. Drivers inside a parked CMV who are not in the sleeper berth must log it as on-duty. [41]

  4. Timekeeping on Mars - Wikipedia

    en.wikipedia.org/wiki/Timekeeping_on_Mars

    A convention used by spacecraft lander projects to date has been to enumerate local solar time using a 24-hour "Mars clock" on which the hours, minutes and seconds are 2.75% longer than their standard (Earth) durations. This has the advantage that no handling of times greater than 23:59 is needed, so standard tools can be used.

  5. Sidereal time - Wikipedia

    en.wikipedia.org/wiki/Sidereal_time

    An increase of 360° in the ERA is a full rotation of the Earth. A sidereal day on Earth is approximately 86164.0905 seconds (23 h 56 min 4.0905 s or 23.9344696 h). (Seconds are defined as per International System of Units and are not to be confused with ephemeris seconds.)

  6. Planetary hours - Wikipedia

    en.wikipedia.org/wiki/Planetary_hours

    The planetary hours are an ancient system in which one of the seven classical planets is given rulership over each day and various parts of the day. Developed in Hellenistic astrology, it has possible roots in older Babylonian astrology, and it is the origin of the names of the days of the week as used in English and numerous other languages.

  7. Timeline for the day of the September 11 attacks - Wikipedia

    en.wikipedia.org/wiki/Timeline_for_the_day_of...

    Within an hour this is confirmed for both Flight 11 and Flight 175. 9:51: Chief Orio Palmer of the FDNY's 7th Battalion reaches the 78th Floor Sky Lobby of the South Tower along with Fire Marshal Ronald Bucca. Palmer reports that there are two pockets of fire and numerous dead bodies. [90]

  8. GPS week number rollover - Wikipedia

    en.wikipedia.org/wiki/GPS_week_number_rollover

    The GPS week number rollover is a phenomenon that happens every 1,024 weeks, which is about 19.6 years. The Global Positioning System (GPS) broadcasts a date, including a week number counter that is stored in only ten binary digits, whose range is therefore 0–1,023. After 1,023, an integer overflow causes the internal value to roll over ...

  9. Daylight saving time - Wikipedia

    en.wikipedia.org/wiki/Daylight_saving_time

    Daylight saving time (DST), also referred to as daylight saving (s), daylight savings time, daylight time (United States and Canada), or summer time (United Kingdom, European Union, and others), is the practice of advancing clocks to make better use of the longer daylight available during summer so that darkness falls at a later clock time. [1 ...

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