A day is approximately the period of time during which the Earth completes one rotation around its axis. A solar day is the length of time which elapses between the Sun reaching its highest point in the sky two consecutive times. Days on other planets are defined similarly and vary in length due to differing rotation periods, that of Mars being slightly longer and sometimes called a sol.
In 1960, the second was redefined in terms of the orbital motion of the Earth in the 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 24 hours, 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: the interval of light between two successive nights, the time between sunrise and sunset; the time of light between one night and the next. For clarity when meaning 'day' in that sense, the word "daytime" may be used instead, though context and phrasing often makes the meaning clear. 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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    happy friendship day to all

    happy friendship day to all
  2. A

    21 fabruary International Mother Language Day 2012

    Amor Ekushe : International Mother Language Day 2012
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    Happy valentine's Day 2012

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    Happy Christmas Day 2011 All imei source Member

    Happy Christmas Day 2011 All IMEI Source Member Happy Christmas Day 2011 All Member
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    16 december happy Victory day Bangladesh

    মহান বিজয় দিবস ১৬ই ডিসেম্বর, ১৯৭১ পাকিস্তানি বাহিনী আত্মসমর্পন করেছিল মুক্তিযোদ্ধা বাহিনী এবং আ্যলাএড ভারতীয় বাহিনীর কাছে। শত সহস্র শহীদের রক্তে রাঙানো এই স্বাধীনতা। আসুন আমরা সবাই আজ তাদের স্মরণ করি। এক সাগর রক্তের বিনিময়ে, বাংলার স্বাধীনতা আনলে যারা আমরা তোমাদের ভুলবো না...
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    BootBox - 11.11.2011 - Immortal day

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    [HAPPY DAY] FuriousGold - ACTIVATION STATUS CHECK IN HERE !

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    GPGWorkshop EVERY DAY UPDATE !!!

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    Happy 65th indian independence day

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    Happy Father,s Day

    Happy Father,s Day The greatest gift I ever had? Came from ; I call him Dad! Thanks for being there through the tears,laughter and dirty diapers. Happy Father’s Day! You may be out of sight but you’re always in my mind! Happy Fathers’Day! I know just the person who needs...
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    26 March-Liberation Day of Bangladesh

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    Hello people!I'm new there! Have a nice day

    Hello people!I'm new there! Have a nice day
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    Ekushey February ... (21st February) is International Mother Language day

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    Happy valentines day to all IMEI Source Members

    Happy valentines day to all IMEI Source Members
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    baned for 3 day( AnywhessAlilsx )

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    baned for 3 day (Vannybusax )

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  18. nerobdms™

    Z3X BOX Samsung Update. Again every day updates

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  19. nerobdms™

    Z3X BOX Samsung Update. Again every day updates

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