Maya and I took this photo of the night sky this evening. She is studying the constellations and asked if I would make a photo of star trails for her. First, Maya escorted me to the golf course across the street and showed me how to find the North Star (by following a line created by two stars in the Big Dipper). She had me frame the photo with the North Star at the center. I then did some calculations and set up an automatic 36-minute exposure at f/11 and ISO 100. We went back inside and waited for the exposure to complete and then another 36 minutes for the camera to do a black frame subtraction (to reduce noise). Before it finished the battery ran out and all was lost. After Maya went to bed, I went back out with a fresh battery and repeated the exercise with this result.