Convert Seconds to Julian Years
Convert Seconds (s) to Julian Years (a_J) instantly and accurately.
Conversion Formula
a_J = s × 3.168808781e-8
About Seconds
The second (s) is the SI base unit of time, defined since 1967 as exactly 9,192,631,770 periods of the caesium-133 ground-state hyperfine transition at 0 K. Caesium fountain clocks realise this to ~10⁻¹⁶ (1 s lost per ~300 million years); optical lattice clocks (Sr, Yb) reach ~10⁻¹⁸. The second links to the metre via the defined speed of light c = 299,792,458 m/s exactly. 1 s = 1,000 ms = 1/60 min.
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.
Quick Reference Table
| Seconds (s) | Julian Years (a_J) |
|---|---|
| 1 s | 3.169 × 10-8 a_J |
| 2 s | 6.338 × 10-8 a_J |
| 5 s | 1.584 × 10-7 a_J |
| 10 s | 3.169 × 10-7 a_J |
| 25 s | 7.922 × 10-7 a_J |
| 50 s | 1.584 × 10-6 a_J |
| 100 s | 3.169 × 10-6 a_J |