astronomical twilight
Under astronomical twilight, the horizon is not discernible and moderately faint stars or planets can be observed with the naked eye under a non light polluted sky. ,2020年11月26日 — As the Sun descends past nautical dusk and into astronomical twilight, when our star is between 12° and 18° below the horizon, its illumination is ...
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 astronomical twilight 相關參考資料
The Differences between Civil, Nautical, and Astronomical ...
Evening civil twilight begins at sunset and ends when the center of the sun reaches 6° below the horizon. The evening civil twilight is otherwise known as dusk. https://www.digital-photo-secr Definitions of Twilight - National Weather Service
Under astronomical twilight, the horizon is not discernible and moderately faint stars or planets can be observed with the naked eye under a non light polluted sky. https://www.weather.gov What is astronomical twilight? - BBC Sky at Night Magazine
2020年11月26日 — As the Sun descends past nautical dusk and into astronomical twilight, when our star is between 12° and 18° below the horizon, its illumination is ... https://www.skyatnightmagazine Nautical Twilight – Definition and Explanation - Time and Date
Similarly, nautical dusk is the instant when the geometric center of the Sun is 12 degrees below the horizon in the evening. It marks the beginning of astronomical ... https://www.timeanddate.com Nautical twilight - Wikipedia
Twilight on Earth is the illumination of the lower atmosphere when the Sun is not directly visible because it is below the horizon. Twilight is produced by sunlight ... https://en.wikipedia.org Dawn - Wikipedia
Astronomical dawn[edit]. Main article: Twilight § Astronomical twilight. Astronomical dawn begins when the sun is 18 degrees below the horizon in the morning. https://en.wikipedia.org Astronomical Twilight – Definition and Explanation
Astronomical twilight is the darkest of the 3 twilight phases. It is the earliest stage of dawn in the morning and the last stage of dusk in the evening. Illustration ... https://www.timeanddate.com The Different Types of Twilight, Dawn and Dusk - Time and Date
Astronomers define the three stages of twilight – civil, nautical, and astronomical – on the basis of the Sun's elevation which is the angle that the geometric ... https://www.timeanddate.com astronomical twilight - 天文曙暮光 - 國家教育研究院雙語詞彙
astronomical twilight. 以astronomical twilight 進行詞彙精確檢索結果. 出處/學術領域, 英文詞彙 ... http://terms.naer.edu.tw What exactly is twilight? | Earth | EarthSky
2019年3月25日 — Civil twilight. It starts as soon as the sun dips below the western horizon. · Nautical twilight. It begins when it's fairly dark outside. · Astronomical ... https://earthsky.org |