Convert Sidereal Years to Olympiads
Convert Sidereal Years (a_sid) to Olympiads (Ol) instantly and accurately.
Conversion Formula
Ol = a_sid × 0.2500094889
About Sidereal Years
The sidereal year = Earth's orbital period relative to the stars = 365.25636 days = 31,558,149.8 s - about 20 min 24 s longer than the tropical year. The gap arises from precession of the equinoxes (~50 arcsec/year westward drift), which causes the tropical year to end slightly before the sidereal orbit completes. JPL DE440 ephemerides and J2000.0 epoch are anchored to the sidereal frame. 1 a_sid = 365.25636 d.
About Olympiads
An Olympiad = exactly 4 Gregorian years = 1,461 days = 126,227,808 s. In ancient Greece it was the standard historical dating system counting from the first Olympic Games at Olympia in 776 BCE; adopted by Hellenistic historians (Polybius, Timaeus). Modern Olympiads are numbered from Athens 1896. The 4-year cycle is mirrored in US presidential elections and EU Parliamentary terms. 1 Ol = 4 yr = 126,227,808 s.
Quick Reference Table
| Sidereal Years (a_sid) | Olympiads (Ol) |
|---|---|
| 1 a_sid | 0.250009 Ol |
| 2 a_sid | 0.500019 Ol |
| 5 a_sid | 1.25005 Ol |
| 10 a_sid | 2.50009 Ol |
| 25 a_sid | 6.25024 Ol |
| 50 a_sid | 12.5005 Ol |
| 100 a_sid | 25.0009 Ol |