Skyclock is the original, and most accurate application showing the daily change in sunrise, sunset, and twilight periods in an intuitive analog clock format.
Why Twilight Awareness Matters
Some examples:
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Twilight periods, sunrise, and sunset, change every day, and are different for every location.
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More car accidents occur during twilight than any other time of day or night.
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In Helena, Montana during the summer, there can be an additional 90 minutes of useable sunlight after sunset.
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Construction supervisors use Skyclock to help manage start and finish times for the work day.
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Golf courses use Skyclock to determine first and last tee times.
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In film, twilight is referred to as "The Magic Hour" because of its dynamic lighting effects.
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Summer in Hawaii has less daylight than summer in Maine.
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In southeast Michigan, including Daylight Saving Time, the difference in sunset time between the summer and winter solstice is over 4 hours.
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Certain pilot licenses are restricted to the hours between the beginning of morning civil twilight and the end of evening civil twilight.
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Some lakes have 'no motorcraft' rules starting at the end of nautical twilight.