![]() During this period, there is enough light from the Sun that artificial sources of light may not be needed to carry on outdoor activities. Evening civil twilight begins at sunset and ends when the center of the Sun reaches 6° below the horizon (the point of civil dusk).ĭuring civil twilight, the unaided eye can observe the brightest stars and also planets such as Venus (which is known as the 'morning star' or 'evening star'). Under civil twilight conditions, the horizon is clearly visible and terrestrial objects are easily perceptible, without artificial light.Ĭivil twilight begins in the morning when the geometric center of the Sun is 6° below the horizon (the point of civil dawn), and ends at sunrise. Define dusk full#Also, if the Sun is 8.5 degrees below the horizon, it provides the same level of illumination to the surface of the Earth as a full Moon directly overhead. Note that the angular diameter of the Sun is 0.5°. The altitudes of the Sun below the horizon are "true geometric" altitudes, that is, refraction by the atmosphere and other small factors influencing the observed position of the Sun are not to be accounted for. The specific positions of the Sun for each of these subcategories are given in the table below.įor these definitions, an ideal horizon 90° from the zenith is used. Based on this definition, there are three established and widely accepted subcategories of twilight: civil twilight (brightest), nautical twilight, and astronomical twilight (darkest). In this sense, the period of daylight (between sunrise and sunset) occurs within the period of twilight.įrom a scientific perspective, twilight is defined according to the position of the center of the Sun relative to the horizon. Send us feedback.Technically, twilight is defined as the portion of the day during which it is possible to conduct outdoor activities without the aid of artificial light, beginning in the morning and ending in the evening. These example sentences are selected automatically from various online news sources to reflect current usage of the word 'gloaming.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. 2020 For now, Nadal has a 24-15 edge in head-to-head matches, and Federer has a 2-1 edge at Wimbledon, having defeated Nadal in the 20 finals before losing in the gloaming in 2008.Ĭhristopher Clarey, New York Times, 10 July 2019 See More 2020 Ivanka Trump tweeted the hashtag #TogetherApart with a photo - apparently years-old - of herself playing with her children in some kind of indoor fort, in the gloaming of some plush parlor.ĭan Zak, Washington Post, 23 Mar. 2020 There were sourdough waffles to start the day and tuna sandwiches for lunch, a few hours of everyone reading novels in separate corners before a long solitary walk in the gloaming, accompanied by gloved waves across generally empty streets. 2021 Queens in the gloaming, the sky a smear of pinks and purples.ĭan Piepenbring, The New Yorker, 25 Nov. 2021 The bar shares an appetizer menu with the restaurant in the gloaming, the seafood towers sparkle. Scott Ostler, San Francisco Chronicle, 29 Aug. 2022 Tony Kemp hit an eighth-inning, two-run homer in the gloaming at the Oakland Coliseum Sunday to give the A’s a 3-1 win over the Yankees in a game that might wind up being the biggest win of the season for the A’s. Scott Ostler, San Francisco Chronicle, 30 Jan. Andrews, Washington Post, 17 July 2022 The game down on the field seems to be played in the gloaming. Recent Examples on the Web So imagine everyone’s delight when Bennifer reemerged from the gloaming after Lopez split with fiance Alex Rodriguez. ![]()
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