Here's a neat web app that shows you sunrise and sunset times and length of day and twilight. I've sometimes considered timing my wakeup in order to start riding at the start of civil twilight or at sunrise, but it's never happened, and now that I'm married with a kid it probably never will!
Sunrise and sunset times in Orangevale
__________________
Genesis 49:16-17
"Well, well!" said Holmes, impatiently. "A good cyclist does not need a high road. The moor is intersected with paths and the moon is at the full."