Crossword puzzle clue "kind of astronomy"

Here are the possible solutions for kind of astronomy clue

Answer
Clue
Relevancy
nautical
Clue
Kind of astronomy
Definition
relating to ships, also NAUTIC
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
Ptolemy treatise on astronomy
Definition
(Arabic) a medieval treatise on astrology and alchemy

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