Combine 4 photos with PowerPoint.

At sunrise or sunset, when the sun is very close to the horizon, almost all the short-wavelength blue-green light is scattered, leaving only yellow-red. At this time, the rainbow and solar corona formed by sunlight passing through water droplets, and the sun dog formed by sunlight passing through ice crystals will only remain yellow and red. It is very different from the common colorful rainbow, solar corona and sun dog. I combined the solar corona, sun dog captured after sunrise on March 19, and the red rainbows captured at sunset before on one picture. This is a beautiful phenomenon unique to sunrises and sunsets!