配对的月亮与月相周期
2020年9月26日 Moon Pairs and the Synodic Month Image Credit & Copyright: Marcella Giulia Pace Explanation: Observe the Moon each night and its visible sunlit portion will gradually change. In phases progressing from New Moon to Full Moon to New Moon again, a lunar cycle or synodic month is completed in about 29.5 days. They look full, but top left to botto...