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This film explains what astronomically happens in a day, a month and a year due to the earth, the moon and the sun. Therefore, days, months and years are something that has been used since ancient times. In this connection, I also explain the seasons. In addition, I also touch on: the North Star, the Big Dipper, the Little Bear, the Big Dipper, Cassiopeia, the moon's fixed rotation, winter solstice, summer solstice, Christmas, Midsummer, new moon, full moon, lunar eclipse, solar eclipse