a) A parallax was expected, according to theory.b) None was detected.
The problem here is that even the closest star (apart from the Sun) are so far away that their parallax is less than one arc-second - i.e., less than 1/3600 of a degree, and therefore hard to measure.
The heliocentric model is the one that replaces the geocentric model because the heliocentric model better described the solar system.
Stellar parallax demonstrates the Earth's motion around the Sun by observing the apparent shift in the position of nearby stars against more distant background stars. This phenomenon confirms the heliocentric model of the solar system and provides direct evidence of the Earth's orbit.
The scientist made the heliocentric model of the solar system. It is a word for the graphical model of our solar system.
Its main strength is that it is the model which is universally accepted by everyone. Copernicus put forward a heliocentric model that used circular orbits. That meant he couldn't completely eliminate all the complications of the old geocentric model, such as "epicycles". Later Kepler showed that the planets move in elliptical orbits. The basic idea of the heliocentric model is that the Sun is at the centre. One of the main strengths is the simplicity of the heliocentric model. Kepler's version (still used today) of the model with its elliptical orbits is particularly elegant and simple, with no epicycles.
The observation of stellar parallaxes is evidence against a geocentric view of the cosmos because parallax shifts in the positions of stars as observed from Earth would not occur if the Earth were at the center of the universe. The fact that we can observe parallax in stars from different positions on Earth supports the heliocentric model, where Earth revolves around the Sun and is not at the center of the cosmos.
Galileo is famous for observing and proving his heliocentric model of the universe. After his observation the existing model of the universe was slowly phased out.
In Copernicus's time, the lack of perceived stellar parallax was not considered strong evidence because people believed that the stars were too distant for their motion to be detected. Additionally, many were entrenched in the geocentric model due to longstanding tradition, religious beliefs, and lack of understanding of heliocentric principles. It took further advancements in observational technology and understanding of astronomy for the heliocentric model to gain widespread acceptance.
The heliocentric model is the one that replaces the geocentric model because the heliocentric model better described the solar system.
Aristotle's main argument against the heliocentric model proposed by Aristarchus was that it did not align with his belief in a geocentric universe centered around the Earth. He based his argument on the apparent lack of observable stellar parallax, which he believed would be present if the Earth were in motion around the Sun.
Stellar parallax demonstrates the Earth's motion around the Sun by observing the apparent shift in the position of nearby stars against more distant background stars. This phenomenon confirms the heliocentric model of the solar system and provides direct evidence of the Earth's orbit.
Copernicus published an alternative model of the planets' movement in 1543 that had the Sun at the centre. It was the first heliocentric model. It used orbits based on combinations of circles, as the ancient Ptolemaic system had done, which was geocentric. In Copernicus's model the paths followed by the planets were less complicated, but other than that Copernicus had no way of proving if it was right or not at that time, so it isn't known whether he believed in it.
Copernicus' heliocentric model was initially rejected primarily due to its conflict with the long-held geocentric view that placed Earth at the center of the universe, which was supported by both religious beliefs and the prevailing scientific consensus. Additionally, the heliocentric model lacked sufficient observational evidence and did not account for the apparent motion of celestial bodies as accurately as the geocentric model did with its complex system of epicycles. Furthermore, the absence of observable parallax in stars and the perceived stability of the Earth contributed to skepticism among contemporaries. It wasn't until later, with improved observations and the work of astronomers like Galileo and Kepler, that the heliocentric model gained wider acceptance.
I believe you are confusing two things here; there is no such thing as a "heliocentric model of telescope". There is a heliocentric model of our Solar System, and there are telescopes. The two are unrelated.
The scientist made the heliocentric model of the solar system. It is a word for the graphical model of our solar system.
In the heliocentric model, the sun is at the center of our solar system and the earth is the third planet that orbits it.
The sun
He is worth knowing about because he revived the Heliocentric modelSome say that he reveled the Heliocentric model but he didn'tBut he was the first person to try to push people to to believe in the Heliocentric model