Flight Day/Night Calculator app analytics for December 26

Flight Day/Night Calculator is a precision offline tool for calculating exact day and night flight time. Built by an airline pilot for pilots at every stage, from first night cross-country to complex ultra-long-range operations with polar twilight transitions, it delivers the accuracy and confidence your logbook demands. Why This App? Aviation authorities require day and night flight time splits, but calculating a precise breakdown is genuinely difficult without specialised tools. The sun’s position changes continuously along your route, and twilight durations vary dramatically with latitude, season, and groundspeed. Most pilots rely on rough estimates or extrapolate from departure and arrival sun events. Many logbook apps do the same, which leads to significant inaccuracies on longer flights or operations at extreme latitudes. Flight Day/Night Calculator makes professional-grade accuracy simple. It performs minute-by-minute position tracking with embedded astronomy algorithms and full twilight calculations, all working completely offline. No guesswork. No manual plotting. Just accurate results you can log with confidence. How It Works The app computes your aircraft’s position every minute using your departure, destination, and optional waypoints (up to 20). At each point it determines the sun’s elevation angle to classify day and night using internationally recognised civil twilight definitions. You can also show nautical and astronomical twilight phases, with sunrise and sunset calculated at sea level or corrected for cruise altitude. Built-In Airport Lookup Search any airport and instantly view sunrise, sunset, morning civil twilight (MCT), evening civil twilight (ECT), and complete twilight information for any date. Perfect for pre-flight planning and comparing sun events at both ends of your route. Key Features - Direct ICAO entry with name confirmation, or full offline airport search - Airport lookup with sunrise, sunset, MCT, ECT, and twilight times for any date - Optional waypoints (up to 20) for realistic routing, or fast great-circle mode - Block time (OOOI) or airborne-only calculations with accurate taxi handling - Optional local time entry with manual UTC offset selection for predictable, DST-safe inputs - Civil, nautical, and astronomical twilight options - Altitude-adjusted sunrise and sunset for cruise flight levels - Customisable logbook notes included in exports - History of recent calculations, storing export text exactly as generated and allowing instant restore - Results in both hours:minutes and decimal hours - Detailed transition events with exact times, coordinates, and optional sun events - Distance, average groundspeed, and airport MCT/ECT calculations - Input validation to prevent unrealistic or impossible entries - Fully offline with no sign-in, no data collection, and no network requirements - Optimised for iPhone and iPad with a clean pilot-focused design - Full support for Light and Dark mode - Designed to Complement Your Logbook Flight Day/Night Calculator works alongside your existing logbook or logbook app, providing reliable day and night splits you can trust. Whether you are building hours toward commercial ratings, maintaining night currency, or logging intercontinental ULR flights, this app helps you maintain the high level of accuracy you aim for in your logbook.