Determine the Remaining Daylight on Your Fingers Use this simple trick to measure the remaining daylight without a watch. Count the finger widths between the sun and the horizon. Each finger is equivalent to 15 minutes, with each hand totaling an hour. When the sun dips low enough that only two hands fit, it’s time to search for a suitable campsite and assemble a shelter (if you’re near the poles, the sun will hover over the horizon for a longer period of time)