Convert Days to Shakes
Convert Days (d) to Shakes (sh) instantly and accurately.
Conversion Formula
sh = d × 8640000000000
About Days
A day (d) = exactly 86,400 s. Earth's actual solar day varies ±16 s due to orbital eccentricity and axial tilt (equation of time). Leap seconds (abandoned in UTC after 2035) corrected the TAI-UT1 divergence. Mars's sol = 24 h 39 min 35 s ≈ 88,775 s; a Martian year = 668.6 sols. The day structures circadian biology, tides, and planetary science. 1 day = 86,400 s = 24 h.
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.
Quick Reference Table
| Days (d) | Shakes (sh) |
|---|---|
| 1 d | 8.64 × 1012 sh |
| 2 d | 1.728 × 1013 sh |
| 5 d | 4.32 × 1013 sh |
| 10 d | 8.64 × 1013 sh |
| 25 d | 2.16 × 1014 sh |
| 50 d | 4.32 × 1014 sh |
| 100 d | 8.64 × 1014 sh |