| 单词 | apsis |
| 释义 | Word Frequency apsis(ˈæpsɪs) nounWord forms: plural apsides (æpˈsaɪdiːz, ˈæpsɪˌdiːz) 1. Also called: apse either of two points lying at the extremities of an eccentric orbit of a planet, satellite, etc, such as the aphelion and perihelion of a planet or the apogee and perigee of the moon. The line of apsides connects two such points and is the principal axis of the orbit 2. another name for apse (sense 1) Derived forms apsidal (æpˈsaɪdəl, ˈæpsɪdəl) adjective Word origin C17: via Latin from Greek; see apse |
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