Glossary term: 角直径
Description: 天体的角直径是指从一个特定位置以角度测量的可见直径。在天文学中，角直径是表示天空中天体大小的一种方法。角直径随着天体物理尺寸的增大而增大，当天体距离较远时，角直径会减小。例如，从地球上看月球和太阳，它们的角直径都是半度左右。月球比太阳小约 400 倍，但看起来大小相同（大约半度），因为太阳离地球的距离是月球的约 400 倍。
See this term in other languagesTerm 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
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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