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1420s

Centuries: 14th century - 15th century - 16th century

Decades: 1370s 1380s 1390s 1400s 1410s - 1420s - 1430s 1440s 1450s 1460s 1470s

Years: 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429

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Dynabee

... 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 ...