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The theory behind this legend goes like this: Daytime is bright, due to the sun. If you view a sunless piece of sky through a long tunnel, there should be no way for the sunlight to get into your eyes. Therefore, you should see stars.
Surprisingly, even though there is no light to catch, the sunflower will continue to bend every day just as it did when it was outside. This is a classic example of what scientists call a circadian rhythm — it’s a daily cycle of behavior that is internal to the organism, rather than being solely triggered by the environment.
If you look at the horizon at sunset–exactly as the last sliver of sun disappears–you might see a flash of brilliant green blaze across the sky.