Lawrence, you’ve caught a double red rainbow – a cousin to an ordinary multi-colored rainbow – that happens when the sun is low in the sky.
See how tall your rainbows are? The height of a rainbow corresponds (inversely) to the height of the sun in your sky. High sun, low rainbow. Low sun, high rainbow. So rainbow-watchers would know, without your having mentioned it, that the sun was low.
Now think about low suns for a moment. They typically appear reddish. That’s because – around sunset – you’re looking at the sun through a greater thickness of atmosphere than when the sun is high in the sky. At such times, the blue and green components of multi-colored sunrays are weakened by scattering during their long journey through the atmosphere to your eyes.
Deborah Byrd created the EarthSky radio series in 1991 and founded EarthSky.org in 1994. Prior to that, she had worked for the University of Texas McDonald Observatory since 1976, and created and produced their Star Date radio series. Today, she serves as Editor-in-Chief of this website. She has won a galaxy of awards from the broadcasting and science communities, including having an asteroid named 3505 Byrd in her honor. In 2020, she won the Education Prize from the American Astronomical Society, the largest organization of professional astronomers in North America. A science communicator and educator since 1976, Byrd believes in science as a force for good in the world and a vital tool for the 21st century. "Being an EarthSky editor is like hosting a big global party for cool nature-lovers," she says.
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