Did we always think that the sun was the centre of the solar system? What evidence is there to support our current knowledge?
No.
Before Copernicus's book from 1543 presented the "heliocentric" theory, scientists held the view that the earth was at the center of the solar system. Until Copernicus' theory was refuted, Ptolemy's "geocentric" theory persisted. Kepler was the one who made the first comprehensive observations about planet orbits and provided a mathematical description of them, eliminating any remaining doubt that the planets truly revolved around the sun.
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No, we did not always think the sun was the center of the solar system. This concept, known as heliocentrism, was proposed by Nicolaus Copernicus in the 16th century. Evidence supporting heliocentrism includes observations of the phases of Venus, the retrograde motion of planets, and the discovery of the laws of planetary motion by Johannes Kepler. Additionally, observations made by Galileo Galilei with his telescope provided further evidence for heliocentrism.
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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
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