If the Hunter's Moon appears orange or reddish near the horizon, what is the underlying cause?

Answer

Atmospheric refraction scatters shorter blue wavelengths of light.

When the moon is low, its light travels through a thicker section of the atmosphere. This thicker path scatters the shorter, bluer wavelengths away, allowing the longer red and orange wavelengths to reach the observer's eye.

If the Hunter's Moon appears orange or reddish near the horizon, what is the underlying cause?
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