Convert Revolutions per day to Revolutions per hour
Convert Revolutions per day (rev/d) to Revolutions per hour (rev/h) instantly and accurately.
Conversion Formula
rev/h = rev/d × 0.04166666667
About Revolutions per day
The revolution per day (rev/d) equals π/43200 rad/s ≈ 7.272 × 10⁻⁵ rad/s, the scale of planetary rotation and orbital mechanics. Earth spins at 1.00274 rev/day (sidereal); Mars at 1.027 rev/day (sol = 24 h 37 min); Jupiter at 2.417 rev/day. Geostationary satellites orbit at exactly 1 rev/solar day; Molniya HEO satellites at 2 rev/day. The Moon is tidally locked at 1/27.322 rev/day. IERS Bulletin A tracks Earth's deviation from 1 rev/solar day to 0.1 ms precision. 1 rev/d ≈ 7.272 × 10⁻⁵ rad/s ≈ 6.944 × 10⁻³ rpm.
About Revolutions per hour
The revolution per hour (rev/h) equals π/1800 rad/s ≈ 1.745 × 10⁻³ rad/s, used for very slow rotating machinery. Cement rotary kilns - the world's longest continuously rotating machines (up to 230 m, 4000 t) - rotate at 1-5 rev/h; ball mills for ore grinding at 10-20 rev/h; concrete mixer trucks at 1-4 rev/h during transport. Large astronomical antenna drives and slow-scan telescope azimuth movements are also conveniently expressed in rev/h. 1 rev/h = π/1800 rad/s ≈ 0.02778 rpm.
Quick Reference Table
| Revolutions per day (rev/d) | Revolutions per hour (rev/h) |
|---|---|
| 1 rev/d | 0.0416667 rev/h |
| 2 rev/d | 0.0833333 rev/h |
| 5 rev/d | 0.208333 rev/h |
| 10 rev/d | 0.416667 rev/h |
| 25 rev/d | 1.04167 rev/h |
| 50 rev/d | 2.08333 rev/h |
| 100 rev/d | 4.16667 rev/h |