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Herschel invention
Answer for the clue "Herschel invention ", 10 letters:
astrometer
Word definitions for astrometer in dictionaries
Wiktionary
Word definitions in Wiktionary
n. An instrument designed to measure the brightness, relation, or apparent magnitude of stars.
The Collaborative International Dictionary
Word definitions in The Collaborative International Dictionary
Astrometer \As*trom"e*ter\, n. [Astro- + meter.] An instrument for comparing the relative amount of the light of stars.