Indeed, the frequency varies over the course of a day as different parts of the earth are exposed to the sun — the oft-cited 7.83 Hz value actually wanders around 7.5 Hz to 8.3 Hz.

Resonant frequencies reveal a map for optimizing single-atom catalysts by Oliver Morsch, ETH Zurich edited by Sadie Harley, reviewed by Robert Egan Editors' notes ...