Crossword puzzle clue "astronomical time periods"

Here are the possible solutions for astronomical time periods clue

Answer
Clue
Relevancy
eons
Clue
Astronomical time periods
Astronomical periods
Definition
EON, a long period of time, also AEON
years
Clue
Astronomical periods
eon
Clue
Periods upon periods
Astronomical time period
Astronomical time span
Definition
a long period of time, also AEON
aeon
Clue
Astronomical unit
Astronomical measurement
Definition
the largest division of geological time, composed of several eras, also EON

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