Convert Shakes to Julian Years
Convert Shakes (sh) to Julian Years (a_J) instantly and accurately.
Conversion Formula
a_J = sh × 3.168808781e-16
About Shakes
A shake = exactly 10 ns (10⁻⁸ s) - the informal unit for fission prompt-neutron generation time, coined at Los Alamos during the Manhattan Project (1943-1945). A prompt-neutron generation in a supercritical core takes ~1-10 shakes; a full explosive chain reaction unfolds over ~50-100 shakes. The name alludes to 'two shakes of a lamb's tail'. Still used in reactor physics and weapons-design calculations. 1 shake = 10 ns.
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
| Shakes (sh) | Julian Years (a_J) |
|---|---|
| 1 sh | 3.169 × 10-16 a_J |
| 2 sh | 6.338 × 10-16 a_J |
| 5 sh | 1.584 × 10-15 a_J |
| 10 sh | 3.169 × 10-15 a_J |
| 25 sh | 7.922 × 10-15 a_J |
| 50 sh | 1.584 × 10-14 a_J |
| 100 sh | 3.169 × 10-14 a_J |