It seems clear from an article by C. H. Kahn in JHS xc (1970) 99–116 that there are still prevalent numerous misconceptions concerning early Greek astronomy. To attempt to correct all these in detail would require a lengthy exposition of elementary points which would be extremely tedious for the discerning reader. There are, however, two matters a lack of understanding of which leads to such erroneous conclusions that one may perhaps be forgiven for a final attempt to clarify the issues.