per·i·ap·sis 
(pĕr′ē-ăpsĭs)
(pĕr′ē-ăpsĭs)n. pl. per·i·ap·si·des (-sĭ-dēz′)
The point at which an orbiting object is closest to the center of mass of the body it is orbiting.
| 单词 | periapsis |
| 释义 | per·i·ap·sis (pĕr′ē-ăpsĭs)n. pl. per·i·ap·si·des (-sĭ-dēz′) The point at which an orbiting object is closest to the center of mass of the body it is orbiting. |
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