Crossword puzzle clue "a last name in astronomy"

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Here are the possible solutions for a last name in astronomy clue

Answer
Clue
Relevancy
galilei
Clue
Last name in astronomy
A last name in astronomy
aeon
Clue
A billion years, in astronomy (Var.)
Definition
the largest division of geological time, composed of several eras, also EON
albedo
Clue
Light ratio in astronomy
Reflectivity measure, in astronomy
Concept in astronomy
Definition
(Latin) the measure of the reflecting power of an object
almagest
Clue
Work on astronomy
Ptolemy's work on astronomy
Definition
(Arabic) a medieval treatise on astrology and alchemy

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