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Suntimes - Android app (and widget collection) that displays sunlight and moonlight times for a given location.
SunCalc - Find out where the sun will be at any time in any location
Sun Surveyor - Sun Surveyor calculates Sun and Moon Positions, Sunrise & Sunset and Moonrise & Moonset...
Sol: Sun Clock - Get reminded when it's sunrise or sunset, wherever you travel!
Alpenglow - Never miss a incredible looking sunrise or sunset again
Solar Clock: Circadian Rhythm - Solar Clock: Circadian Rhythm syncs the Solar time with your Local time and shows important events (Sunrise, Waking up, Breakfast, Lunch, Solar Noon, Sport, Sunset, Sleep Time, …) based on Circadian rhythm.