To measure the most accurate parallax possible from Earth's surface, we would make two measurements of a star's position on the sky separated by
A) 6 hours.
B) 12 hours.
C) 24 hours.
D) 6 months.
E) 12 months.

Question

Quizplus · Accepted Answer

The most accurate parallax measurement is obtained by observing the star from opposite sides of Earth's orbit, which takes 6 months.

To Measure the Most Accurate Parallax Possible from Earth's Surface