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  2. Circadian rhythm - Wikipedia

    en.wikipedia.org/wiki/Circadian_rhythm

    Though variation is great among normal chronotypes, the average human adult's temperature reaches its minimum at about 5:00 a.m., about two hours before habitual wake time. Baehr et al. [ 91 ] found that, in young adults, the daily body temperature minimum occurred at about 04:00 (4 a.m.) for morning types, but at about 06:00 (6 a.m.) for ...

  3. Chronobiology - Wikipedia

    en.wikipedia.org/wiki/Chronobiology

    They are relevant e.g. for marine life, as the level of the tides is modulated across the lunar cycle. Gene oscillations – some genes are expressed more during certain hours of the day than during other hours. Within each cycle, the time period during which the process is more active is called the acrophase. [4]

  4. 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 ...

  5. Day - Wikipedia

    en.wikipedia.org/wiki/Day

    The period of light when the Sun is above the local horizon (that is, the time period from sunrise to sunset) The time period from 06:00–18:00 (6:00 am – 6:00 pm) or 21:00 (9:00 pm) or another fixed clock period overlapping or offset from other time periods such as "morning", "afternoon", or "evening".

  6. Human life - Wikipedia

    en.wikipedia.org/wiki/Human_life

    Human life span, statistical measure of the average time a human being is expected to live. Human Life Amendment, various proposals to amend the United States Constitution to prohibit abortion. Human Life International, an American-based Roman Catholic activist anti-abortion organization. The Human Life Review, a quarterly journal devoted to ...

  7. List of time periods - Wikipedia

    en.wikipedia.org/wiki/List_of_time_periods

    The categorisation of the past into discrete, quantified named blocks of time is called periodization. [1] This is a list of such named time periods as defined in various fields of study. These can be divided broadly into prehistorical periods and historical periods (when written records began to be kept).

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  9. Time - Wikipedia

    en.wikipedia.org/wiki/Time

    Time is the continuous progression of our changing existence that occurs in an apparently irreversible succession from the past, through the present, and into the future. [1] [2] [3] It is a component quantity of various measurements used to sequence events, to compare the duration of events (or the intervals between them), and to quantify rates of change of quantities in material reality or ...