Question

How did we calculate the length of an astronomical unit

Answer 1

Answer:

Astronomical unit (AU, or au), a unit of length effectively equal to the average, or mean, distance between Earth and the Sun, defined as 149,597,870.7 km (92,955,807.3 miles). ... Comparison of the observations would reveal an apparent shift, or angular (parallax) displacement, of the Sun against the remote stars.