Copernicus and Tycho Brahe estimated the Earth-Sun distance to be 1,142 to 1,150 Earth radii .
29–33 , van Helden 1985 Later in Europe , Copernicus and Tycho Brahe also used comparable figures ( and Earth radii ) , and so Ptolemy 's approximate Earth–Sun distance survived through the 16th century.pp .
Astronomical unit