Decades: 1130s 1140s 1150s 1160s 1170s - 1180s - 1190s 1200s 1210s 1220s 1230s
Years: 1175 1176 1177 1178 1179 - 1180 - 1181 1182 1183 1184 1185
Births
Deaths
... the gyro is spinning, tipping the device will cause the gyroscope to start precessing, with its axis slipping around in the groove in a circular fashion. The groove inside ...