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How to Calculate Twilight Time

Twilight is the period of time between sunset and nightfall. In other words, it is the time in which the sun is setting but it isn't dark yet. Since the start of twilight is different depending on where you are, you may want to calculate the time it occurs. To do this, you must know your longitude, latitude and time zone.

Instructions

    • 1

      Find your longitude and latitude. To do this, visit an online calculator. These types of calculators ask you for your zip code in order to find longitude and latitude.

    • 2

      Visit an online sunrise, sunset and twilight calculator. These calculators will allow you to enter your longitude, latitude and time zone in order to find the times.

    • 3

      Enter in your longitude and latitude.

    • 4

      Enter your time zone

    • 5

      Enter the date for which you want information on twilight time

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