Meanings
nounHill sphere (plural Hill spheres)
plural Hill spheres
- astronomyThe region in which a given astronomical body dominates the attraction of satellites.
Synonyms: Roche sphere, Hill radius
Synonyms & antonyms
nounThe region in which a given astronomical body dominates the attraction of satellites.
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Also see
Origin
Defined by the American astronomer George William Hill.
Full word history & related roots →Cite this entry
APA
Hill sphere. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/Hill%20sphere
MLA
“Hill sphere.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/Hill%20sphere. Accessed November 4, 2026.
Chicago
WatkinsX Dictionary, s.v. “Hill sphere,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/Hill%20sphere.
Source: Hill sphere on Wiktionary, CC BY-SA 4.0.