Answer:
The word "protracted" means lasting longer than expected, or unusually long, so what protracted most clearly means based on the context of the excerpt is how the time period of celestial motion studies must have lasted unusually long.
You basically just use the opposite as what is described. Ex: build is to destroy, as allow is to create
Nope Texting Shouldn't Be Illegal Because Texting Itself Isn't Bad Its What People Send That Might Be Bad And To The People That Don't Send Bad Texts It Would Be Unfair
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