Convert Shakes to Synodic Months
Convert Shakes (sh) to Synodic Months (syn.mo) instantly and accurately.
Conversion Formula
syn.mo = sh × 3.919350925e-15
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 Synodic Months
A synodic (lunar) month = new moon to new moon = 29.5306 days = 2,551,442.9 s. Longer than the sidereal month (27.32 d) because Earth advances ~27° in its orbit during that time; the Moon must travel further to realign with the Sun. Islamic Hijri, Hebrew lunisolar, and Chinese calendars are built on synodic months. Eclipses repeat via the Saros cycle (18 yr 11 d = 223 synodic months). 1 syn.mo ≈ 29.5306 d.
Quick Reference Table
| Shakes (sh) | Synodic Months (syn.mo) |
|---|---|
| 1 sh | 3.919 × 10-15 syn.mo |
| 2 sh | 7.839 × 10-15 syn.mo |
| 5 sh | 1.96 × 10-14 syn.mo |
| 10 sh | 3.919 × 10-14 syn.mo |
| 25 sh | 9.798 × 10-14 syn.mo |
| 50 sh | 1.96 × 10-13 syn.mo |
| 100 sh | 3.919 × 10-13 syn.mo |