Description: 远日点是绕太阳公转轨道上距太阳最远的点。绕太阳运行且不受任何其他天体影响的天体，其轨道呈椭圆形，太阳位于该椭圆的焦点之一。在数学上，远日点标志着椭圆主轴的一端。在这个词中，”ap“表示最远点，”heliion“表示太阳。因此，只有当中心天体是太阳时才可以使用该术语。当中心天体是一颗非太阳恒星时，该术语为"apastron"或"apoastron"；当绕行的中心天体是地球时，该术语为"apogee"。无论中心体是什么，一般的术语都是”apoapsis”。

Related Terms:

• Ellipse
• 轨道
• Perihelion
• Solar System

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".