IN a recent communication 1, Nonweiler demonstrates the proposition that an external couple applied to a rigid body about its instantaneous axis of rotation in the sense opposing its rotation tends to ...

Earth's axial precession is a gyroscopic wobble, analogous to a spinning top, causing its axis of rotation to trace a cone over time. The primary cause of Earth's precession is the gravitational ...

For any matrix in the rotation group SO₃, we give the explicit expression for its axis and angle of rotation without computing eigenvectors. The formulas depend only on the entries of the matrix, ...