Nautical dawn rings in the period of nautical twilight, which ends at civil dawn.Д¬ivil dawn, the brightest instance of dawn, occurs when the geometric center of the Sun's disk is 6В° below the horizon. As the horizon becomes faintly visible during this stage, seafarers can use it as a reference point when navigating by the stars. The sunlight reflected by the atmosphere is now generally sufficient to distinguish the sky from land or water in clear weather conditions. The 3 stages of dawn and morning Nautical DawnДЄt nautical dawn, the geometric center of the Sun's disk reaches an angle of 12 degrees below the horizon. Astronomers may be unable to observe some of the fainter stars and galaxies as the Sun passes this mark.ДЄstronomical dawn marks the beginning of astronomical twilight, which lasts until nautical dawn. However, at this point, the twilight is so faint that it is generally indistinguishable from night, especially in areas with light pollution. The Earth's upper atmosphere begins to scatter and reflect the sunlight, illuminating the lower atmosphere. When the Sun passes the elevation angle of -18 degrees as it ascends towards the horizon before sunrise, a very small portion of its rays begin to permeate the firmament. Precise dawn and sunrise times for your city Astronomical Dawn

Civil dawn вЂ“ the geometric center of the Sun's disk is 6В degrees below the horizon.

Nautical dawn вЂ“ the geometric center of the Sun's disk is 12В degrees below the horizon.

Astronomical dawn вЂ“ the geometric center of the Sun's disk is 18В degrees below the horizon.

As with dusk, astronomers differentiate between three different stages of dawn, each marking the beginning of one of the three phases of morning twilight: Science specifies dawn as a particular moment defined by the solar elevation angle, which is the position of the Sun in relation to the horizon. В©/kavalenkava volha Scientific Definition

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What is the opposite of dawn