English
Etymology
From AGr. polytonic|�ε�ί "around" + polytonic|����ον "star".
Pronunciation
IPA|/p�rɪ�æstr�n/
Noun
en-noun
- That point of the orbit of a celestial body which is closest to the star around which the body is orbiting.
de:periastron
ru:periastron
zh:periastron
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