"Where is the Sun" is a free iPhone application developed by Xing Chen, falling under the Utilities & Tools category. This app provides users with the ability to track the position of the sun, offering valuable insights for various purposes. Users can optimize their photography by determining the best times for capturing images, plan their travels to avoid harsh sunlight, and satisfy their curiosity by understanding the sun's trajectory in the sky.

Additionally, "Where is the Sun" offers information on insolation, aiding users in understanding the amount of sunlight entering through a window. This feature can be beneficial for those looking for a new living space to comprehend the implications of window orientation and to explain temperature variations in a room throughout the day.