Nanohertz (nHz)
The nanohertz (symbol: nHz) is an SI unit of frequency equal to one billionth of a hertz (10^-9 Hz), or one cycle every 31.69 years. It measures extremely low-frequency periodic phenomena across extended temporal scales. In modern astrophysics, nanohertz frequencies are critical for gravitational wave detection via pulsar timing arrays, which search for subtle spatial ripples caused by supermassive black hole binaries orbiting over multi-year periods.
Frequency
- Nanohertz (nHz)1
- Microhertz (µHz)1×10⁻³
- Millihertz (mHz)1×10⁻⁶
- Hertz (Hz)1×10⁻⁹
- Kilohertz (kHz)1×10⁻¹²
- Megahertz (MHz)1×10⁻¹⁵
- Gigahertz (GHz)1×10⁻¹⁸
- Terahertz (THz)1×10⁻²¹
Rotational speed
- Cycle per second (cps)1×10⁻⁹
- Revolutions per minute (rpm)6×10⁻⁸
- Beats per minute (BPM)6×10⁻⁸
Angular velocity
- Radian per second (rad/s)6.28×10⁻⁹
- Radian per minute3.77×10⁻⁷
- Radian per hour2.26×10⁻⁵
- Radian per day5.43×10⁻⁴
- Degrees per second3.6×10⁻⁷
- Degrees per minute2.16×10⁻⁵
- Degrees per hour1.3×10⁻³
- Degrees per day0.03