Convert Julian Years to Centuries
Convert Julian Years (a_J) to Centuries (cent) instantly and accurately.
Conversion Formula
cent = a_J × 0.01000020534
About Julian Years
The Julian year (a_J) = exactly 365.25 days = 31,557,600 s - the IAU standard year for astronomical distances. The light-year is formally 1 ly = c × 1 a_J = 9.461 × 10¹⁵ m (IAU 2012 B2). Julian years differ from Gregorian years by only 648 s (~10.8 min/year); important for high-precision astrometry or calculations spanning centuries. 1 a_J = 365.25 d = 31,557,600 s.
About Centuries
A century = exactly 100 Gregorian years ≈ 3.156 × 10⁹ s. Standard unit of historical periodisation (the 20th century, the 18th-century Enlightenment). IPCC projects warming and sea-level rise on century timescales. Precession of the equinoxes advances ~1.39°/century, so zodiac constellations no longer match their named seasons. Ice-core and radiocarbon records are commonly displayed at century resolution. 1 century = 100 yr.
Quick Reference Table
| Julian Years (a_J) | Centuries (cent) |
|---|---|
| 1 a_J | 0.0100002 cent |
| 2 a_J | 0.0200004 cent |
| 5 a_J | 0.050001 cent |
| 10 a_J | 0.100002 cent |
| 25 a_J | 0.250005 cent |
| 50 a_J | 0.50001 cent |
| 100 a_J | 1.00002 cent |