Days to Prahar (d to prahar)
1 day equals 8 prahar exactly.
How to convert days to prahar
To convert days to prahar, multiply the number of days by 8. This factor is exact. To go the other way, multiply prahar by 0.125.
prahar = days × 8
Example: 10 days = 80 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
Day (d)
24 hours or 86,400 seconds. The mean solar day; the actual rotation of the Earth is about 4 minutes shorter (see sidereal day).
Old English dæg is the root of our day, with close cousins in German Tag, Dutch dag and Icelandic dagur, all descending from Proto-Germanic dagaz. It is the oldest unit here, because the cycle of light and dark needs no instrument. Yet the day we count is a constructed average: the actual interval from one noon to the next varies through the year by up to about 7.9 seconds, because Earth's orbit is elliptical and its axis is tilted.
Astronomers smooth this out with a fictitious mean Sun, giving the mean solar day, and the day in the SI sense is fixed at exactly 86,400 seconds. Reality has drifted slightly: the mean solar day has recently averaged about 86,400.002 seconds, and tidal drag from the Moon is lengthening it by about 2 milliseconds per century. That is why 27 leap seconds were added to UTC between 1972 and 2022. One rotation measured against the distant stars is shorter, about 23 hours 56 minutes 4.09 seconds, and a year contains one more of these sidereal days than solar days.
1 day = 86,400 seconds (exactly).
Sources: Wikipedia: Day; BIPM: SI Brochure, 9th edition
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 days (reverse)
- Days to seconds
- Days to minutes
- Days to hours
- Days to weeks
- Days to months
- Days to years
- Days to milliseconds
- Days to microseconds
- Days to nanoseconds
- Days to decades
- Days to centuries
- Days to millennia
- Seconds to prahar
- Minutes to prahar
- Hours to prahar
- Weeks to prahar
- Months to prahar
- Years to prahar
See all time units.