Both are correct in different circumstance. We use compared to when the subjects are of different orders, for example Compared to a brick, this car is aerodynamic. We use compared with when the...
"Astr" is from the word for "star" and "labe" is from the word "to take". It is an instrument used to take the positions of celestial bodies, hence its label as "star-taker".
is a historical astronomicalinstrument used by astronomers, navigators, and astrologers. Its many uses include locating and predicting the positions of the Sun, Moon, planets, and stars; determining...