Several of the roughly 50 Chinese calendars also divided each ke into 100 fen, although others divided each ke into 60 fen. Other numbers of ke per day were used during three short periods: 120 ke from 5 to 3 BC, 96 ke from 507 to 544 CE, and 108 ke from 544 to 565. The midnight-to-midnight day was divided both into 12 double hours ( traditional Chinese: 時辰 simplified Chinese: 时辰 pinyin: shí chén) and also into 10 shi / 100 ke ( Chinese: 刻 pinyin: kè) by the 1st millennium BC. Main article: Traditional Chinese timekeepingĭecimal time was used in China throughout most of its history alongside duodecimal time. It also adjusts well to digital time representation using epochs, in that the internal time representation can be used directly both for computation and for user-facing display. ![]() 54321 can be interpreted as five decimal hours and 43 decimal minutes and 21 decimal seconds after the start of that day, or a fraction of 0.54321 (54.321%) through that day (which is shortly after traditional 13:00). This property also makes it straightforward to represent a timestamp as a fractional day, so that. For instance, 1 h23 m45 s is 1 decimal hour, 23 decimal minutes, and 45 decimal seconds, or 1.2345 decimal hours, or 123.45 decimal minutes or 12345 decimal seconds 3 hours is 300 minutes or 30,000 seconds. Therefore, it becomes simpler to interpret a timestamp and to perform conversions. The main advantage of a decimal time system is that, since the base used to divide the time is the same as the one used to represent it, the representation of hours, minutes and seconds can be handled as a unified value. This term is often used specifically to refer to the time system used in France from 1794 to 1800, during the French Revolution, which divided the day into 10 decimal hours, each decimal hour into 100 decimal minutes and each decimal minute into 100 decimal seconds ( 100 000 decimal seconds per day), as opposed to the more familiar UTC time standard, which divides the day into 24 hours, each hour into 60 minutes and each minute into 60 seconds ( 86 400 SI seconds per day). The large dial shows the ten hours of the decimal day in Arabic numerals, while the small dial shows the two 12-hour periods of the standard 24-hour day in Roman numerals.ĭecimal time is the representation of the time of day using units which are decimally related. History/origin: The term "minute" is derived from the Latin "pars minuta prima" which means the "first small part." The minute was originally defined as 1/60 of an hour (60 seconds), based on the average period of Earth's rotation relative to the sun, known as a mean solar day.Ĭurrent use: The minute, as a multiple of the second, is used for all manner of measurements of duration, from timing races, measuring cooking or baking times, number of heart beats per minute, to any number of other applications.French decimal clock from the time of the French Revolution. Under Coordinated Universal Time, a minute can have a leap second, making the minute equal to 61 rather than 60 seconds. ![]() Minuteĭefinition: A minute (symbol: min) is a unit of time based on the second, the base unit of the International System of Units (SI). The term also has other colloquial uses such as the day of the week and fixed clock periods like 6:00 am to 6:00 pm, among others. It is also used to reference daytime, or the period of time during which the sun is above the horizon. The second, and therefore the day, was again re-defined in 1967 by atomic electron transition.Ĭurrent use: The day is a term used worldwide within many contexts one of the most common of which is to refer to a time interval of 24 hours. ![]() This was later re-defined in terms of the second in 1960, when the second was redefined in terms of Earth's orbital motion in the year 1900. History/origin: The term "day" originates from the Old English term "dæg." It is approximately equal to the period required for the Earth to complete a full rotation with respect to the sun. Definition: A day (symbol: d) is an accepted, non-SI unit of time that is defined based on the SI (International System of Units) unit of time, the second, and is equal to 86,400 seconds.
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