Convert Shakes to Sidereal Days
Convert Shakes (sh) to Sidereal Days (sid.d) instantly and accurately.
Conversion Formula
sid.d = sh × 1.160576284e-13
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 Sidereal Days
A sidereal day = Earth's rotation period relative to the stars = 23 h 56 min 4.0905 s = 86,164.0905 s - ~3 min 56 s shorter than the 24 h solar day because Earth advances ~1° in its orbit each day. Equatorial telescope mounts rotate at one turn per sidereal day to track stars. VLBI, GPS orbit determination, and polar-motion monitoring use sidereal rotation as their reference. 1 sid. day = 86,164.0905 s.
Quick Reference Table
| Shakes (sh) | Sidereal Days (sid.d) |
|---|---|
| 1 sh | 1.161 × 10-13 sid.d |
| 2 sh | 2.321 × 10-13 sid.d |
| 5 sh | 5.803 × 10-13 sid.d |
| 10 sh | 1.161 × 10-12 sid.d |
| 25 sh | 2.901 × 10-12 sid.d |
| 50 sh | 5.803 × 10-12 sid.d |
| 100 sh | 1.161 × 10-11 sid.d |