As a high school sophomore in 1970, Ken Day knew what he wanted to do with his life. He bought a camera and set out to learn photography. From sunrise to sunset, he would explore his world, photographing everything from nature to sports to the homeless.   After graduation from Sacramento State University in the late 1970s, Day landed a job at Sacramento PBS station KVIE. Two years later, he was hired by an NBC affiliate in Boise, Idaho. Then, it was back to Sacramento and CBS station KOVR where he stayed 15 years working as a news photographer. Day