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  2. Polar night - Wikipedia

    en.wikipedia.org/wiki/Polar_night

    The opposite phenomenon, polar day or midnight sun, occurs when the Sun remains above the horizon for more than 24 hours. There are multiple ways to define twilight, the gradual transition to and from darkness when the Sun is below the horizon. [2] "Civil" twilight occurs when the Sun is between 0 and 6 degrees below the horizon.

  3. 24-hour clock - Wikipedia

    en.wikipedia.org/wiki/24-hour_clock

    24-hour digital clock in Miaoli HSR station. A public 24-hour clock in Curitiba, Brazil, with the hour hand on the outside and the minute hand on the inside.. A time of day is written in the 24-hour notation in the form hh:mm (for example 01:23) or hh:mm:ss (for example, 01:23:45), where hh (00 to 23) is the number of full hours that have passed since midnight, mm (00 to 59) is the number of ...

  4. Daytime - Wikipedia

    en.wikipedia.org/wiki/Daytime

    The poles are still cold during their respective summers, despite seeing 24 hours of daylight for six months, while the Equator remains warm throughout the year, with only 12 hours of daylight per day. Although the daytime length at the Equator remains 12 hours in all seasons, the duration at all other latitudes varies with the seasons.

  5. Solar time - Wikipedia

    en.wikipedia.org/wiki/Solar_time

    On a prograde planet like the Earth, the sidereal day is shorter than the solar day. At time 1, the Sun and a certain distant star are both overhead. At time 2, the planet has rotated 360° and the distant star is overhead again (1→2 = one sidereal day). But it is not until a little later, at time 3, that the Sun is overhead again (1→3 = one solar day). More simply, 1→2 is a complete ...

  6. Hour - Wikipedia

    en.wikipedia.org/wiki/Hour

    Midnight to 1 a.m. on a 24-hour clock with a digital face. An hour (symbol: h; [1] also abbreviated hr) is a unit of time historically reckoned as 1 ⁄ 24 of a day and defined contemporarily as exactly 3,600 seconds . There are 60 minutes in an hour, and 24 hours in a day.

  7. Why “Everyone Has the Same 24 Hours” Is Not a Good ... - AOL

    www.aol.com/lifestyle/why-everyone-same-24-hours...

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  8. Date and time representation by country - Wikipedia

    en.wikipedia.org/wiki/Date_and_time...

    In Czech quarters and halves always refer to the following hour, e.g. čtvrt na osm (quarter on eight) meaning 7:15, půl osmé (half of eight) meaning 7:30 and tři čtvrtě na osm (three-quarters on eight) meaning 7:45. This corresponds to the time between 7:00 and 8:00 being the eighth hour of the day (the first hour starting at midnight).

  9. Why the 24-hour flight cancellation rule is a myth - AOL

    www.aol.com/article/2016/04/17/why-the-24-hour...

    Current U.S. regulations state that airlines must allow a customer to cancel a ticket within 24 hours of purchase, if the reservation is made more than a week in advance of departure or allow a ...