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A day, a unit of time, is approximately the period of time during which the Earth completes one rotation with respect to the Sun (solar day). In 1960, the second was redefined in terms of the orbital motion of the Earth in year 1900, and was designated the SI base unit of time. The unit of measurement "day", was redefined as 86 400 SI seconds and symbolized d. In 1967, the second and so the day were redefined by atomic electron transition. A civil day is usually 86 400 seconds, plus or minus a possible leap second in Coordinated Universal Time (UTC), and occasionally plus or minus an hour in those locations that change from or to daylight saving time.
Day can be defined as each of the twenty-four-hour periods, reckoned from one midnight to the next, into which a week, month, or year is divided, and corresponding to a rotation of the earth on its axis. However its use depends on its context, for example when people say 'day and night', 'day' will have a different meaning. It will mean the interval of light between two successive nights; the time between sunrise and sunset. People tend to sleep during the night and are awake at a day, in this instance 'day' will mean time of light between one night and the next. However, in order to be clear when using 'day' in that sense, "daytime" should be used to distinguish it from "day" referring to a 24-hour period; this is since daytime typically always means 'the time of the day between sunrise and sunset. The word day may also refer to a day of the week or to a calendar date, as in answer to the question, "On which day?" The life patterns (circadian rhythms) of humans and many other species are related to Earth's solar day and the day-night cycle.

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  1. venumgall

    Wallis Day - SexLife s02e03-06 (2023)1080p

    Wallis Day - SexLife s02e03-06 (2023)1080p Duration: 0:01:25 Resolution: 1920x1080 Format: mp4 Size: 52.6 MB
  2. D

    Valentine’s Day te Ke ke sex korechen & kar sathe…?

    Valentine’s Day te kara kara sex korchen.? Experience jante chai. Ami just bowr sathe korechi…
  3. I'm-Nobody

    Happy Valentine's Day

  4. choto79

    femjoy_Bree H - All Day

  5. choto79

    You have never Seen a Video like this "Sex Under Water" Nice Day -2

    You have never Seen a Video like this "Sex Under Water" Nice Day -2
  6. choto79

    DomingoView : Anna Rubia, Was long day

  7. choto79

    femjoy_Anna T - Day In Paradise

  8. নির্জনে পথিক

    Bollywood offers some RAINY DAY STYLING!

    The Monsoon has arrived. But in Bollywood, it rains all year round. The romance of pitter-patter drives its eternal love for song and dance as well as rituals of a rainy day styling. Waterproof makeup The leading lady must look like a dream at all times. No storm, tsunami or hurricane...
  9. M

    This is my first day st Nirjon Mela

    This am very new at nirjon mela
  10. Day

    হারেম এর বন্দিনী

  11. Day

    Hi, I'm Day Walker

    I like bangla choti and to be fatacisize.;)