When two objects in orbit have periods of revolution that are simple ratios of each other (such as 1 to 2 or 1 to 3) we say that we have a resonance.
Hi! When two objects in orbit have periods of revolution that are simple ratios of each other (such as 1 to 2 or 1 to 3), we say that we have a "resonance" or "orbital resonance." This phenomenon occurs when the gravitational interaction between the objects causes their orbits to synchronize in a stable pattern, leading to the observed ratios in their periods of revolution.