Decades: 300s BC 290s BC 280s BC 270s BC 260s BC - 250s BC - 240s BC 230s BC 220s BC 210s BC 200s BC
Years: 256 BC 255 BC 254 BC 253 BC 252 BC - 251 BC - 250 BC 249 BC 248 BC 247 BC 246 BC
Births
Deaths
... optic gyroscope wikipedia.org dumped 2003-03-17 with ...