This is an illusion. The yellow or golden or orangish or reddish color of the moon shortly after it rises is a physical effect, which stems from the fact that, when you see the moon low in the sky, you are looking at it through a greater amount of atmosphere than when the moon is overhead. Northern hemisphere around September 23rd, Southern hemisphere around March 21st. Known as the harvest moon because it rises close to sunset giving extra light to farmers harvesting crops.
Science & Nature >
Atmospheric Phenomena
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