The main difference between sunset and dusk is that dusk is considered the process and transition to the night, whereas sunset is a specific point that proceeds it. Night-time is classified as the moment when the Sun reaches 18 degrees below the horizon.Īt this point, it will no longer illuminate the sky. However, astronomically, dusk starts at the very end of astronomical twilight.ĭusk is the darkest moment of twilight, just before it becomes the night. Astronomical twilight: which is the period when the Sun is at least 12 degrees below the horizon, but no more than 18 degrees.ĭusk generally refers to the process and transition from day- to-night.Nautical twilight: Is the second phase, which begins when the Sun is between 6 and 12 degrees below the horizon,.This period continues until the Sun has descended at least 6 degrees below the horizon. Civil twilight: which starts the moment the Sun drops below the horizon.Sunset is classified as a separate phenomenon from twilight, which is divided into three stages: Whereas, Summer and Autumn have the longest days, with later sunsets.įor people within the Northern Hemisphere, the latest sunset will occur during June/July.īut for those in the Southern Hemisphere, the latest sunset occurring during December (as the seasons are reversed). These factors mean that the Winter and Spring have the shortest days, with earlier sunsets. Earth and moons linked revolutions to one another.Earths movement and orbit around the sun,.Observers location on earth (longitude, latitude, and elevation).The time of sunset changes routinely across the year, depending on the following factors: In astronomy, the exact time sunset occurs is when the upper limb of the sun drops below the horizon.Īlthough, due to atmospheric conditions, sunlight is distorted to the extent where the sun is typically around one diameter below the horizon when the sunset is seen. This is due to the Earth’s rotation around the sun. Sunset, which sometimes is referred to as sundown, is the time in the evening when the sun drops below the horizon.
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