thirty-yearly

Updated: May 29, 2025

If, however, the earth is left motionless, we must go first from the very short rule of the moon to ever greater ones to the two-yearly rule of Mars, from that to the twelve-yearly one of Jupiter, from here to the thirty-yearly one of Saturn, and then suddenly to an incomparably greater sphere, to which also we must ascribe a complete rotation in twenty-four hours.

Edward Huntington Williams - A History of Science — Volume 2