Radian per hour to Degrees per minute

When the object moves so slowly that rad/s and even rad/min produce inconveniently small numbers. Earth's rotation is 0.2618 rad/hr — much friendlier than 7.27 × 10⁻⁵ rad/s. Astronomical telescope tracking, tidal lock studies, and satellite orbital mechanics often involve motions where one rotation takes hours, days, or longer. Rad/hr keeps the numbers readable while preserving the radian basis.

The Moon completes one orbit (2π radians) in about 27.32 days, or roughly 655.7 hours. That gives approximately 0.00958 rad/hr. Compared to Earth's rotation at 0.2618 rad/hr, the Moon's orbital angular speed is about 27 times slower — which is why moonrise drifts about 50 minutes later each day.

Tectonic plates move at a few centimeters per year, but because they sit on a sphere, that linear drift corresponds to a tiny angular rotation about an Euler pole. The fastest plate — the Pacific — rotates at roughly 10⁻⁸ rad/hr (about 0.00000001 rad/hr). That is around a billion times slower than a clock hour hand. Geophysicists describe plate motion this way because angular velocity around an Euler pole neatly captures both the speed and the curved trajectory of every point on the plate.

A geostationary satellite orbits Earth once per sidereal day (~23.934 hours), matching Earth's rotation. Its angular speed is 2π ÷ 23.934 ≈ 0.2625 rad/hr — essentially the same as Earth's surface rotation. That is the whole point: the satellite appears stationary over one spot on the equator because it rotates at the same angular velocity as the ground below it.

Not typically as a primary readout, but it appears in computed outputs from navigation software, satellite tracking systems, and geophysics simulations. Inertial navigation units report gyro drift budgets in °/hr (degrees per hour), and converting to rad/hr is a single multiplication. The unit is more common in calculations and papers than on any physical gauge dial.

A full circle is 360° and the minute hand completes it in 60 minutes: 360 ÷ 60 = 6°/min. It is one of those satisfying integer results in everyday physics. The hour hand, by contrast, moves at 0.5°/min (360° ÷ 720 minutes). At any given time, the angle between them changes at 5.5°/min — which is the key to solving those "when do the hands overlap?" puzzles.

The Sun crosses the sky at 15°/hr (360° ÷ 24 h), or 0.25°/min. A single-axis solar tracker matches this rate, adjusting continuously or in small steps throughout the day. Dual-axis trackers also compensate for the Sun's seasonal altitude change — a much slower adjustment of roughly 0.5–1° per week. The daily tracking rate of 0.25°/min is slow enough that you cannot see the panel moving.

Large rotary cement kilns typically rotate at 1–5°/min (roughly 0.003–0.014 RPM). That glacial pace is intentional: raw material needs 30–60 minutes to travel the kiln's 50–100 meter length, slowly heating to 1,450°C. Faster rotation would push material through before it fully reacts. Industrial drum dryers and composting drums operate in a similar 2–10°/min range.

Divide by 360. One full revolution is 360°, so degrees per minute ÷ 360 = RPM. The clock minute hand at 6°/min is 6/360 = 0.01667 RPM — one revolution per hour. A turntable at 33⅓ RPM is 33.33 × 360 = 12,000°/min. For rad/min, multiply °/min by π/180 ≈ 0.01745.

Most revolving restaurants complete one full rotation in 45–90 minutes, which translates to 4–8°/min. The slow rate is deliberate — fast enough that diners get a complete panoramic view during a meal, but slow enough that you do not notice the motion or feel any inertia. The famous revolving restaurant atop the BT Tower in London took about 22 minutes per revolution (16.4°/min) when it operated.