Decades: 820s 830s 840s 850s 860s - 870s - 880s 890s 900s 910s 920s
Years: 873 874 875 876 877 - 878 - 879 880 881 882 883
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... a force applied to it and will start rotating perpendicular to the force applied. This is why spinning gyro tops will not simply fall over, but start precessing ...