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Calculate nautical twilight times for any location. Find when the horizon is visible for navigation and when stars appear for celestial positioning.

Calculate civil twilight times for any location and date. Find dawn and dusk times when outdoor activities are still possible without artificial light.

Calculate sun angles and shadow lengths for any date and location. Professional solar altitude/azimuth data with CSV export.

Create sun path diagrams for any location. See daily and seasonal solar angles, sunrise/sunset paths. Export SVGs for architecture and solar planning.

Interactive daylight hours graph showing annual daylight variation for any location worldwide. Compare cities and visualize seasonal patterns.

Interactive world map showing real-time day/night boundaries, twilight zones, and local times. Features sunrise/sunset data, timezone detection, city search.

Interactive calculator/calendar to track moon phases. Moon path, visualizations, supermoons, blue moons, moonrise/sets, sky position, and more for any location.