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Earth-based: the day is based on the time it takes for the Earth to rotate on its own axis, as observed on a sundial [citation needed]. Units originally derived from this base include the week (seven days), and the fortnight (14 days). Subdivisions of the day include the hour (1/24 of a day), which is further subdivided into minutes and seconds ...
In the Brāhmaṇas, muhūrta denotes a division of time: 1/30 of a day, or a period of 48 minutes. [3] An alternative meaning of "moment" is also common in the Brāhmanạs. [4] In the Rigveda [5] muhūrta exclusively means, "moment". [6] Each muhūrta is further divided into 30 kalā, (1 kalā = 1.6 minutes or 96 seconds).
Such alternative units did not gain any notable acceptance. In China, during the Song dynasty, a day was divided into smaller units, called kè . One kè was usually defined as 1 ⁄ 100 of a day until 1628, though there were short periods before then where days had 96, 108 or 120 kè. [7] A kè is about 14.4 minutes, or 14 minutes 24 seconds.
The quantity dps (dpm) is the number of atoms that have decayed in one second (one minute), not the number of atoms that have been measured as decayed. [ 1 ] The efficiency of the radiation detector and its relative position to the source of radiation must be accounted for when relating cpm to dpm.
This property also makes it straightforward to represent a timestamp as a fractional day, so that 2025-02-10.54321 can be interpreted as five decimal hours, 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).
Clock time and calendar time have duodecimal or sexagesimal orders of magnitude rather than decimal, e.g., a year is 12 months, and a minute is 60 seconds. The smallest meaningful increment of time is the Planck time―the time light takes to traverse the Planck distance, many decimal orders of magnitude smaller than a second. [1]
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In other regions, where the relative length of day and night varies according to the season, the praharas of the day will be longer or shorter than the praharas of the night. Contemporary discussions of prahara often use 7:00 am (the time of sunrise at the equator and at the equinoxes ) as a theoretical fixed point of reference for mapping out ...