A Civil Twilight

A Civil Twilight shows the four solar times that define usable light: • First light — morning civil twilight begins • Sunrise — morning twilight ends • Sunset — evening twilight begins • Last light — evening civil twilight ends Glance at your watch or phone and know exactly how much light you have left — out hunting, on the water, flying, photographing, or just planning a dawn run. WHY CIVIL TWILIGHT? Civil twilight (sun within 6° below the horizon) is the standard that many hunting regulations, FAA night-flight logging rules, and boating navigation-light requirements are written around. It is also the photographer's blue hour. This app gives you those boundaries precisely, not approximately. ON YOUR IPHONE • Today's four times, front and center, on a twilight-sky backdrop • Swipe up or down to step through days; jump anywhere with the full-screen calendar • Twilight alerts: get…