从0点到12点,分针和时针垂直的时间是:
(1)整点的有2次:3点正,9点正;
(2)分针在前的有8次:0点16.4分,1点21.8分,2点27.3分,3点32.7分,4点38.2分,5点43.6分,6点49.1分,7点54.5分;
(3)时针在前的有8次:4点5.5分,5点10.9分,6点16.4分,7点21.8分,8点27.3分,9点32.7分,10点38.2分,11点43.6分;
(4)两针分别接近“12”并在“12”两侧的有4次:0点49.1分,1点54.5分,10点5.5分,11点10.9分.
共22次.