bitalignment
Bitalignment is a term used in celestial mechanics to describe the degree to which the orbital planes of two or more bodies within a single gravitational system are aligned with one another. In planetary or satellite systems, it typically refers to the mutual orientation of the orbits, quantified by the mutual inclination between orbital planes relative to a common reference plane.
Bitalignment characterizes how coplanar a system is. A high level of bitalignment means the orbits lie close
Bitalignment can arise from the system’s formation within a single protoplanetary or protosatellite disk, which efficiently
Mutual inclination is inferred from transit geometry in exoplanetary systems, transit timing and duration variations, astrometric
A highly aligned system tends to be dynamically stable over long timescales and favors coplanar configurations
See also: orbital inclination, mutual inclination, nodal line, coplanarity, secular dynamics.