Geller and Huchra discovered the Great Wall on the first three sections of the CfA (Center for Astrophysics) redshift survey, which covered the region from eight to 16 hours of right ascension and from 26.5 to 42.5 degrees of (north) declination. Although the Leo and Hercules Clusters lie slightly south of this region, the authors make it clear that the same structure extends south of the survey boundaries. The wall of galaxies is skewed to our line of sight, with a mean redshift distance that varies from Z = 0.023 (~350 million light years) in Leo to Z = 0.033 (~500 million light years) in Hercules.
