Who was the first person to measure the parallax of a star successfully?
A) Sir George Airy in England
B) Henry Norris Russell in the United States
C) Tycho Brahe in Denmark
D) Friedrich Wilhelm Bessel in Germany

Question

Quizplus · Accepted Answer

Friedrich Wilhelm Bessel was the first person to successfully measure the parallax of a star, 61 Cygni, in 1838, thereby directly calculating the distance to a star outside our solar system for the first time.

Who Was the First Person to Measure the Parallax of a Star