Glossary term: 暈
Description: 暈是地球大氣中冰晶引起的光學現象。就像水滴中的折射和反射形成彩虹一樣，陽光通過冰晶時會在其中發生反射和折射，形成暈。暈可以呈現出多種不同形式，既可以由太陽光引起，也可以由月光引起。其中，22度暈是一種圍繞太陽或月亮形成的薄光帶圓環。這種暈的幾何形狀是由陽光或月光通過大氣中的冰晶時所產生的特性決定的。
“暈”一詞在其他天文學領域中也有使用，包括：星系暈、暗物質暈和恆星暈，它們都是構成星系結構的一些主要組成部分。
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Term and definition status: The original definition of this term in English have been approved by a research astronomer and a teacher The translation of this term and its definition is still awaiting approval
This is an automated transliteration of the simplified Chinese translation of this term
The OAE Multilingual Glossary is a project of the IAU Office of Astronomy for Education (OAE) in collaboration with the IAU Office of Astronomy Outreach (OAO). The terms and definitions were chosen, written and reviewed by a collective effort from the OAE, the OAE Centers and Nodes, the OAE National Astronomy Education Coordinators (NAECs) and other volunteers. You can find a full list of credits here. All glossary terms and their definitions are released under a Creative Commons CC BY-4.0 license and should be credited to "IAU OAE".
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