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Crepuscular means = "at twilight". This doesn't just happen at twilight. It happens throughout the day. You can see it with your own eyes.

The Sun's rays aren't parallel. They are focused though. That's the subtle difference between sunlight and light from a bulb. In movie making, the way they mimic sunlight with fake lights is to put a curved lens in front of the light to focus it. Sort of like a reverse camera lens. Interesting, isn't it?