Years to Olympiads (yr to olympiad)
1 year equals 0.25 olympiads exactly.
How to convert years to olympiads
To convert years to olympiads, multiply the number of years by 0.25. This factor is exact. To go the other way, multiply olympiads by 4.
olympiads = years × 0.25
Example: 10 years = 2.5 olympiads.
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
Year (yr)
The average Gregorian calendar year of 365.2425 days (31,556,952 seconds). A common year has 365 days and a leap year 366.
A year is the Earth's trip around the Sun, but there are several versions. The tropical year, which tracks the seasons, is about 365.2422 days. The sidereal year, measured against the stars, is about 365.2564 days, roughly 20 minutes longer, because the Earth's axis precesses. Calendars must squeeze these into whole days, which is the origin of leap years. English year descends from Old English gear, while Latin annus, the source of annual, comes from a different root.
The Gregorian calendar, introduced by Pope Gregory XIII's bull of 24 February 1582, fixed the problem of Julian drift that had moved the March equinox away from 21 March and upset the date of Easter. Ten days were skipped, so Thursday 4 October was followed by Friday 15 October. Its rule of skipping leap days in century years not divisible by 400 gives a mean year of 365.2425 days, the value this site uses for the year. Britain and its empire switched in 1752 and Russia in 1918. Scientists write the year as a, with the Julian year fixed at 31,557,600 seconds.
1 year = 31,556,952 seconds (exactly).
Sources: Wikipedia: Year; Wikipedia: Gregorian calendar
Olympiad (olympiad)
Four years, the interval between ancient Olympic Games. The Greeks dated events by the Olympiad.
Greek historians dated events by Olympiads, the four-year cycles that began with each celebration of the Games at Olympia. The traditional first Olympiad starts in the summer of 776 BC, the date given for the victory of Coroebus. Hippias of Elis compiled the first full list of victors, now lost, and Timaeus of Tauromenium used the system consistently in the 3rd century BC.
Some ancient writers called an Olympiad a five-year period, but that came from inclusive counting, and each cycle was in fact four years long. Because the Games took place in midsummer, an Olympiad year ran from one summer to the next and did not match the Roman consular year beginning in January. Early dates were applied backwards and are less reliable. The modern Olympiad is also four years, but it starts on 1 January of years divisible by four, beginning with 1896. Four Gregorian years is about 126.2 million seconds.
1 olympiad = 126,227,808 seconds (exactly).
Sources: Wikipedia: Olympiad
Related conversions
- Olympiads to years (reverse)
- Years to seconds
- Years to minutes
- Years to hours
- Years to days
- Years to weeks
- Years to months
- Years to milliseconds
- Years to microseconds
- Years to nanoseconds
- Years to decades
- Years to centuries
- Years to millennia
- Seconds to olympiads
- Minutes to olympiads
- Hours to olympiads
- Days to olympiads
- Weeks to olympiads
- Months to olympiads
See all time units.