Astronomy: what causes a blood moon?
Self-tutoring about astronomy: the tutor mentions the cause of a “blood” moon.
As I understand, a blood moon can only happen near the time of a lunar eclipse.
The redness of a blood moon comes from the fact that the light reaching it has, to some extent, already travelled through Earth’s atmosphere. My understanding is that red light passes through with less deflection, so when the Earth is partially in the way between the sun and moon, the sun’s light that reaches the moon is preferentially red. That same light reflects back, and we see a blood moon.
Source:
Jack of Oracle Tutoring by Jack and Diane, Campbell River, BC.
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