Scientists are able to predict the phase of the moon for every day of the year by understanding the mechanics of the Earth-Moon-Sun system. The relative positions of these celestial bodies determine the amount of sunlight that reflects off the Moon, resulting in different lunar phases. By calculating these positions using astronomical observations and mathematical models, scientists can accurately predict the phase of the Moon for any given date and time. Factors considered in these predictions include the Moon's orbit around Earth, Earth's orbit around the Sun, and the angle between the Earth, Moon, and Sun.これらの計算により、天文学者は月のカレンダーを作成し、月の外観について長期的な予測を行うことができます。