Decades: 740s 750s 760s 770s 780s - 790s - 800s 810s 820s 830s 840s
Years: 787 788 789 790 791 - 792 - 793 794 795 796 797
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... why spinning gyro tops will not simply fall over, but start precessing around. (The precessing motion is perpendicular to the torque trying to make the gyro fall ...