Non rotating stem allows a non-spinning disc, ensures low torque and prevents torsional damage of the packing.

A method is developed for correcting the accuracy of non rotating and aspherical lens by controlling the pressure of the polishing die during computer controlled optical surfacing (CCOS).

An object approaching simple Schwarzschild-type (non-rotating) black hole's center will appear to distant observers as having an increasingly slow descent as the object approaches the event horizon.