nHz

nanohertz

Frequencyexact by definition

The nanohertz is 10⁻⁹ hertz, one cycle every 31.7 years. It is the band pulsar timing arrays search for gravitational waves in: supermassive black hole binaries radiate at nanohertz frequencies, and detecting them requires decades of timing residuals from millisecond pulsars across the galaxy.

1 nHz 1.0000000e-09 Hz