Crossword puzzle clue "astronomical time span"

Here are the possible solutions for astronomical time span clue

Answer
Clue
Relevancy
eon
Clue
Astronomical time span
Astronomical time period
Definition
a long period of time, also AEON
week
Clue
Time's time span
eons
Clue
Astronomical time periods
Definition
EON, a long period of time, also AEON
aeon
Clue
Geologic time span
Vast time span
Time span in a geology book
Really long time span
Definition
the largest division of geological time, composed of several eras, also EON

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