What astronomical advancement was crucial in confirming the Sun was just another star like those seen at night?
Answer
Accurately measuring the immense distances to other stars (stellar parallax)
The realization solidified when astronomers could accurately measure the immense distances to other stars, proving the Sun was simply a star that was incredibly close.

Related Questions
What is the fundamental criterion separating a star from a planet?Approximately what percentage of the total mass in our solar system does the Sun contain?Why is the nearest star specifically named 'the Sun' rather than just 'a star'?What does the 'G' in the Sun's G2V classification denote?What does the Roman numeral 'V' in the Sun's G2V classification signify regarding its life stage?How does the Sun's relative size compare to Betelgeuse, based on the provided comparison table?By what approximate factor is the Sun closer to Earth than Proxima Centauri?What astronomical advancement was crucial in confirming the Sun was just another star like those seen at night?What specific concept regarding Earth is calculated directly from the Sun's current energy output (luminosity)?What unique benefit does studying the Sun provide for stellar physics models of distant stars?