Sunset is the daily disappearance of the sun below the horizon of the earth's rotation. As seen from the equatorial region, the equinox sunset sets just west of both spring and autumn. As seen from mid-latitudes, local summers travel southwest for the northern hemisphere, but northwest for the southern hemisphere.
The time of sunset is defined in astronomy as the moment when the upper limbs of the sun disappear below the horizonNear the horizon, atmospheric sunlight develops so that geometrically the solar disk is geometrically below one diameter of the horizon after a sunset is observed. The sunset differs from the twilight, which is divided into three stages, the first being the civilvilite which begins after the sun disappears below the horizon and continues to the degree below the horizon; the second stage is the nautical twilight, 6 to 12 degrees below the horizonIn; and the third is the twilight of astronomy, which is between 12 and 18 degrees below the sun's horizon. At the very end of the evening astronomy twilight, and just before night, the dark moment of twilight occurs at night when the sun reaches 18 degrees below the horizon and the skyDoes not illuminate.
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The daily disappearance of the sun below the horizon of the rotation of the sunset earth. As seen from the equatorial region, the equinox sunset sets just west of both spring and autumn. As seen from mid-latitudes, local summers travel southwest for the northern hemisphere, but northwest for the southern hemisphere.