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Table of Sunrise/Sunset, Moonrise/Moonset, or Twilight Times for an Entire Year. This data services provides a method for obtaining a table of the times of sunrise/sunset, moonrise/moonset, or...
Twilight is the time between day and night when the Sun is below the horizon but its rays still light up the sky. Astronomers differentiate between 3 phases: Civil twilight; Nautical twilight ; Astronomical twilight; The 3 twilight phases on a world map. Nautical Twilight. Each twilight phase is defined by the solar elevation angle, which is ...
Complete Sun and Moon Data for One Day. This data service provides rise, set, and transit times for the Sun and Moon, civil twilight beginning and end times , and lunar phase...
Nautical twilight occurs when the center of the Sun is between 6 degrees and 12 degrees below the horizon. This twilight period is less bright than civil twilight and artificial light is generally required for outdoor activities. Nautical dawn occurs when the Sun is 12 degrees below the horizon during the morning.
This calculator provides the times of nautical twilight at a user-defined position, for today and at fortnightly intervals during a selected calendar year. The times of sunrise and sunset are included, and all times are adjusted to reflect the UTC offset of the user's clock.
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The figure below shows civil, nautical and astronomical twilight. Note that the angles are not to scale so as to show the three twilight categories with more clarity. Source: https://w1.weather.gov/ glossary/
Jan 1, 2003 · Nautical twilight is that span of time from when the sun’s center is six degrees below the horizon to when it is 12 degrees below the horizon. Since we can’t see the sun, however, we have no way of measuring its angle below the horizon.
