Roy Lewallen wrote in
:

with a rotational speed of omega * t radians/sec. The reason the
time-dependent rotational term

Should that be ...of omega radians/sec..., omega*t is the phase
displacement, omega is the phase velocity?

You're right. Thank you for the correction. My apology for the error.

And to correct myself, I really should have said angular displacement and
angular velocity respectively.

Owen