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Related to Secondary rainbow: Colors of the rainbow
A regional term for LSD
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A difference is that the secondary rainbow is always perfect circular, as its position in the sky is insensitive to the flattening that occurs for large falling drops (Konnen 1987).
The secondary rainbow is fainter, but more colourful in the reverse order.
In a secondary rainbow, light is reflected through raindrops:
The light in each droplet is reflected twice in a secondary rainbow.