Decades: 1210s 1220s 1230s 1240s 1250s - 1260s - 1270s 1280s 1290s 1300s 1310s
Years: 1263 1264 1265 1266 1267 - 1268 - 1269 1270 1271 1272 1273
Births
Deaths
... perpendicular to the force applied. This is why spinning gyro tops will not simply fall over, but start precessing around. (The precessing motion is perpendicular to the ...