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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.
Twilight occurs according to the solar elevation angle θ s, which is the position of the geometric center of the Sun relative to the horizon. There are three established and widely accepted subcategories of twilight: civil twilight (nearest the horizon), nautical twilight, and astronomical twilight (farthest from the horizon).
- Civil twilight. Let’s consider the stages of twilight as occurring after sunset. Keep in mind that they would reverse their order at sunrise. Civil twilight begins the moment the sun slips below the horizon.
- Nautical twilight. In the evening, nautical twilight takes over where civil twilight ends. The definition of nautical twilight is the time period when the center of the sun is 6 degrees below the horizon to 12 degrees below the horizon.
- Astronomical twilight. The darkest twilight stage is astronomical twilight. The definition of astronomical twilight is the period of time when the center of the sun is 12 degrees below the horizon to 18 degrees below the horizon.
Feb 27, 2024 · Civil twilight is the brightest phase of twilight, while astronomical twilight is the darkest, and occurs just before or after night. The phases of twilight occur in the same order anywhere on Earth, but how long they last is based on your location on Earth. Civil twilight occurs when the sun is between 0 degrees and 6 degrees below the horizon.
Aug 20, 2024 · Civil twilight starts at sunset and ends roughly 45 minutes later when the sun’s center has plunged six degrees below the horizon—equal to 12 times its own width. According to most municipal ordinances, streetlights must be on at that time. Nautical twilight occurs when the sun’s center is between 6 and 12 degrees below the horizon.
Sep 9, 2022 · While it's common to confuse twilight with dusk and dawn, they are different events. Dusk and dawn occur when the Sun’s center is at the exact point below the horizon; twilight occurs between these points. For example, when the Sun is exactly 18° below the horizon — it’s called astronomical dusk (or dawn), but the interval from 12° to ...
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Oct 9, 2016 · Twilight. Watching the Sun set below the horizon and the sky gradually get darker and darker is an almost magical experience. Twilight is that period of the day when the sky is not completely dark, and it can be used to describe the period either just after sunset, or just before sunrise. It is valued by photographers because of the the soft ...
