I keep a Sunrise/Sunset chart for my town posted on my fridge. I use it more in the morning as a gauge of when to wake up. I usually get up at Civil Twilight. This way by the time I get dressed, pump up my tires and get out the door it is light enough to ride without lights.
For the evening however, I don't think I would ride past Sunset without lights for others to see me. Civil twilight is for me is the time I can personally last see without compromising my safety.
As others have said however, always go on the side of caution when using your lights.



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