invariable plane

Fetched 2026-10-26 (cache).

Datamuse reports no synonyms or antonyms for this word.

Noun

1. {{lb|en|astronomy}} The [[orbital]] [[plane]] passing through a [[planetary system]]'s [[barycenter]] ([[center of mass]]) [[perpendicular]] to its [[angular momentum]] [[vector]].

Source: Wiktionary · CC BY-SA 4.0 (Wiktionary dump) · cached copy, not a rewrite.