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Suntimes - Android app (and widget collection) that displays sunlight and moonlight times for a given location.
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.
SunCalc - Find out where the sun will be at any time in any location
Rise: Track Sleep & Circadian - Wake up & fall asleep better
Sol: Sun Clock - Get reminded when it's sunrise or sunset, wherever you travel!
Alpenglow - Never miss a incredible looking sunrise or sunset again