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11451_행성의 운동 이해하기
K10-2obsplanets-1-coming-closer-061207(20210220)
K10-2obsplanets-2-defining-directions-051127
K10-2obsplanets-3-venusian-orbit-051127(20210220)
K10-2obsplanets-4-motion-of-sun-venus-051127(20210220)
K10-2obsplanets-5-time-of-aday-051127(20210220)
K10-2obsplanets-6-problem-solving-051127(20210220)
Youngwoo Cho