The problem is that Galileo and other astronomers at that time were not successful in finding the hypothesized stellar parallax.ĭuring Galileo’s time, they were not able to observe stellar parallax, but only because the technology was not there yet. But if the Earth is in motion around the Sun, then we should be able to observe stellar parallax. In 1632, Galileo defended Copernicus’ heliocentric system that the Sun is at the center of the solar system and Earth is in motion around the Sun. In reality, stellar parallax has been successfully measured in 1838 and is now used as the basis for measuring stellar distances. Some flat-Earthers claim that stellar parallax has never been successfully observed, and they use it as ‘evidence’ Earth is stationary. Successful measurement of stellar parallax was done only after the 19th century.
It is the result of Earth’s orbital motion around the Sun.
Stellar parallax is the apparent shift of the position of a nearby star against the background of distant stars.
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