Unless you’re immortal, most of us rise & retire daily with the burning globe in the sky (our sun). As a photographer and human, my very existence depends heavily on the sun- to light the subjects I capture and eat the food I enjoy -among many other things. I encourage you to stop and think about how much the sun plays a part of your daily life and in the role of mankind- it is mind boggling for something we take for granite everyday. From outcomes of large battles or crop harvests, to planning your daily run, and the kids soocer practice, the sun dictates life! Here is a link to the U.S. Naval Observatory that I use every time I plan my photography shoots or out of door adventures. http://bit.ly/DAwii It is helpful because it informs the user of the begin & end of civil twilight so you know when it is completely dark, the phase of the moon, and the transits of the sun & moon.