Lightphase is a clock for natural light. It tells you which light you are standing in, the minute it changes, and how long you have left.
Shooting the overlook at golden hour? Lightphase gives you the minute it starts and the minute it ends.
Hiking back after sunset? It tells you when Civil Twilight runs out, the last light you can walk by without a headlamp.
Waiting for a dark sky? It shows when night begins, which is often more than an hour after sunset.
Every phase of light, named
Lightphase divides the day by the sun's angle into the phases photographers and hikers plan around, and names each one in plain words.
Daylight. The sun is high, the light is flat and the shadows are short and hard.
35° Window. Low enough for directional light, with fuller color and more contrast than golden hour. The long, workable stretch of morning and afternoon.
Golden Hour.…
From the developer’s store description.