![]() Twilight is also the name of a book (and movie) that caused the town of Forks to be inundated by teenage girls hoping to spot a vampire. We have twilight because after sunset, sunlight reflects off our atmosphere to illuminate the earth until the sun has moved (I know it’s the Earth that’s actually rotating, but from our perspective) more than 18 degrees below the horizon. (Astronomers will tell you that sunset is when the geocentrical center of the sun is 50 minutes of arc below the horizon, but they’re just showing off their big, sciencey words.) Dusk is when it actually gets dark. ![]() Sunset is the moment when the top edge of the sun meets the horizon. If you doubt that, just ask an astronomer, a photographer or the law. While we often use “sunset” and “dusk” interchangeably, they’re actually two different times. The law doesn’t used the word “dusk” it uses “sunset.” On a side note, wouldn’t it be great if our correctness was judged on how many words we got right instead of the overall level of accuracy of a statement based on one incorrect word? Okay, maybe that’s a terrible idea, but anyone with good grammar could be factually wrong a lot and still have a high correctness score. And based on the word count in your question, you’re roughly 95 percent right about the law. Wouldn’t it make more sense to require headlights before it gets dark instead of after? And if someone doesn’t have their headlights on at night is it okay to flash my lights to let them know?Ī: You’re absolutely right about it making sense to turn headlights on before it gets dark. Q: I recently found out that headlights are required 30 minutes after dusk.
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