A red rainbow happens when the sun is low

red rainbow

I saw a cloud that looked like ocean waves. What is it?

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red rainbow

A red rainbow happens when the sun is low

red rainbow

A red rainbow happens when the sun is low

A red rainbow happens when the sun is low

EarthSky Community Photos, EarthSky

red rainbow

What caused this red-only rainbow?, Rainbow

This week's bright auroras, EarthSky.org