Glossary term: 天文单位
Description: 天文单位（AU）是一个方便的距离单位，正好等于 149,597,870.7 千米（km）。大约是地球与太阳之间的平均距离，这也是以前对天文单位的定义。AU通常用于测量太阳系和其他行星或恒星系统中的距离。例如，海王星的轨道距离太阳约 30 AU。
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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
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".
