Crossword puzzle clue "concept in astronomy"

Here are the possible solutions for concept in astronomy clue

Answer
Clue
Relevancy
albedo
Clue
Concept in astronomy
Light ratio in astronomy
Reflectivity measure, in astronomy
Definition
(Latin) the measure of the reflecting power of an object
paula
Clue
2014 Robin Thicke concept album (if "maybe stalking can win my wife back?" is a concept)
aeon
Clue
A billion years, in astronomy (Var.)
Definition
the largest division of geological time, composed of several eras, also EON
almagest
Clue
Work on astronomy
Ptolemy's work on astronomy
Ptolemy treatise on astronomy
Definition
(Arabic) a medieval treatise on astrology and alchemy

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