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Herschel invention
Answer for the clue "Herschel invention ", 10 letters:
astrometer
Word definitions for astrometer in dictionaries
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.
Wiktionary
Word definitions in Wiktionary
n. An instrument designed to measure the brightness, relation, or apparent magnitude of stars.