Why were early astronomers unable to detect stellar parallax?

Answer 1

Pressumably, they didn't have the high-precision devices required to measure those angles. You must consider that we are talking about extremely small angles - even the closest star has a parallax of less than one arc-second (1/3600 of a degree).

Answer 2

Among other things, the stellar parallax is evidence of the Earth's movement around the Sun. The fact that stellar parallax was not immediately detected is because the parallax angle is very small - less than one arc-second, even for the closest stars.

Answer 3

Early astronomers were unable to detect stellar parallax because the distances to stars were much greater than previously thought, leading to extremely small parallax angles. The technology and instruments available at the time were not precise enough to measure these tiny angles accurately. It wasn't until the 19th century, with the advancement of telescope technology and more accurate measurements, that stellar parallax was finally observed.

Answer 4

Because stellar paradox is so tiny that you cannot see it, and there were no precision instruments capable of measuring such tiny angles back then.

Answer 5

Stellar parallax is very small - for the nearest star it is less than one arc-second. Therefore it is hard to measure.