Redirected from 647 BC
Decades: 690s BC 680s BC 670s BC 660s BC 650s BC - 640s BC - 630s BC 620s BC 610s BC 600s BC 590s BC
Significant People
... the gyroscope's evasive action towards the externally applied force will cause one end of the axis to push against the upper rim of the groove, while the other end of the ...