Submitted by György Chityil ... on Fri, 01/19/2018 - 23:58 Hierarchy: NounDescription: {{astronomy}} The change in apparent position of a celestial body due to that body's velocity relative to the Sun.Ngram: proper motionNgram Text: proper motionSource: WiktionaryIssue: 0Wiktionary tag: astronomyNgram Count: 2
