Riccioli said that the best of cannoneers could fire a ball right into the mouth of an enemy's cannon; if this deflection effect existed in northward shots they would have detected it.
里乔利说，最好的炮手可以将炮弹射进敌人的炮口中；如果这一偏转效果存在于朝北的射击中，他们会发现它。