Seconds to Prahar (s to prahar)
1 second equals 0.00009259259259 prahar (rounded).
How to convert seconds to prahar
To convert seconds to prahar, multiply the number of seconds by 0.00009259259259. The factor is rounded to 10 significant digits. To go the other way, multiply prahar by 10,800.
prahar = seconds × 0.00009259259259
Example: 10 seconds = 0.0009259259259 prahar.
Months and years are not constant. This site uses the average Gregorian year of 365.2425 days, so one 'year' converts to 365.2425 days, not 365; use 'common year' for exactly 365 days.
About these units
Second (s)
The SI base unit of time, defined by the radiation frequency of the cesium-133 atom: 9,192,631,770 cycles per second.
Our word second is a leftover of Latin. Medieval scholars divided a degree, and later the hour, into 60 parts called pars minuta prima, the first small part, and divided those again into pars minuta secunda, the second small part. NIST traces the roots further back: Babylonian and Greek astronomers split the circle into 360 degrees, and around 150 C.E. Ptolemy split each degree into 60 minutes and each minute into 60 seconds. Clocks that could show seconds appeared only in the later 16th century, and Christiaan Huygens's pendulum clock of 1656 was the first able to keep time accurately to the second.
For most of history the second was a fraction of a day, and in 1956 it was redefined as a fraction of the tropical year, a definition the SI took over in 1960. In 1967 the 13th CGPM switched to atoms: 9,192,631,770 periods of the radiation tied to a hyperfine transition of caesium-133. The 2019 SI revision restated this by fixing the caesium frequency at 9,192,631,770 hertz. NIST reports that commercial caesium clocks stay within about a three-millionth of a second per year, and experimental clocks based on other atoms are roughly ten thousand times more precise.
The second is the reference unit for time on this site.
Sources: NIST: the second and the SI redefinition; BIPM: SI Brochure, 9th edition; Wikipedia: Second
Prahar (prahar)
Three hours: an eighth of a day. Traditional South Asian watches of the day and night.
Hindi speakers still say dopahar for afternoon, literally two prahars, and Bengali has the related dui-pohor. The Sanskrit prahara divides the day and night into eight watches, four starting at sunrise and four at sunset. In the standard model each lasts about three hours, though traditionally the length followed the real sunrise and sunset, so day watches were longer in summer and night watches longer in winter.
A nineteenth-century note cited by Wikipedia puts northern India's day prahars at roughly 3.5 hours near the summer solstice and 2.5 hours in winter. The figure used here is the fixed three-hour watch. Four prahars correspond to fifteen muhurtas, but the two systems agree only at sunrise and sunset, since a muhurta is a fixed 48 minutes.
Prahars matter in Indian classical music, where each raga is prescribed for a particular watch. The link between raga and time is already in Narada's Sangita Makaranda, dated between the 7th and 11th centuries, and Wikipedia argues the idea is older than Bhatkhande, who died in 1936.
1 prahar = 10,800 seconds (exactly).
Sources: Wikipedia: Prahara; Wikipedia: Hindu units of time
Related conversions
- Prahar to seconds (reverse)
- Seconds to minutes
- Seconds to hours
- Seconds to days
- Seconds to weeks
- Seconds to months
- Seconds to years
- Seconds to milliseconds
- Seconds to microseconds
- Seconds to nanoseconds
- Seconds to decades
- Seconds to centuries
- Seconds to millennia
- Minutes to prahar
- Hours to prahar
- Days to prahar
- Weeks to prahar
- Months to prahar
- Years to prahar
See all time units.