Hours to Olympiads (h to olympiad)

1 hour equals 0.00002851986466 olympiads (rounded).

1 hour = 0.00002851986466 olympiads

How to convert hours to olympiads

To convert hours to olympiads, multiply the number of hours by 0.00002851986466. The factor is rounded to 10 significant digits. To go the other way, multiply olympiads by 35,063.28.

olympiads = hours × 0.00002851986466

Example: 10 hours = 0.0002851986466 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

Hour (h)

Metric (SI)Current unit

60 minutes or 3,600 seconds, one twenty-fourth of a mean solar day.

Egyptian astronomers gave us the twelve. Coffin lids from about 2150 BC show the night divided into exactly 12 intervals, tied to the rising of star groups called decans, and the day was later split into 12 hours with sundials. These were seasonal hours, a twelfth of the daylight, so a summer hour was longer than a winter one. The word itself comes from Greek hora, originally any span of time, through Latin and Old French into English in the 13th century.

Equal hours of 1/24 of a day were probably first proposed by Hipparchus, and mechanical clocks made them the practical choice, since a clock showing seasonal hours had to be readjusted every morning and evening. Today the hour is exactly 3,600 seconds and is a non-SI unit accepted for use with the SI. Civil time still bends it a little: UTC hours have lasted 3,601 seconds 27 times since 1972 to keep clocks within 0.9 seconds of the Earth's rotation. In practice we use it for working shifts, travel times and electricity bills measured in kilowatt-hours.

1 hour = 3,600 seconds (exactly).

Sources: Wikipedia: Hour; BIPM: SI Brochure, 9th edition

Olympiad (olympiad)

Ancient GreekHistorical unit (no longer in standard use)

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

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