At very rare intervals all of the planets would sing together in "perfect concord": Kepler proposed that this may have happened only once in history, perhaps at the time of creation.
在非常罕見的間隔所有的行星將一起唱「完美和諧」：克卜勒提出，這可能發生在歷史上只有一次，也許在行星形成的時候。