Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/science/cosmology-and-astronomy/earth-history-topic/moon-phases-and-eclipses/v/intro-to-moon-phases
An introduction to the size of the Moon, the distance to the Moon, the relation of the 28-day cycle of the Moon to a month and understanding the phases of the Moon.
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