Dialogue concerning the two chief world systems: Ptolemaic and Copernican Dialogue Concerning the Two Chief World Systems：Ptolemaic and Copernican 书名原文:Dialogue Concerning the Two Chief World Systems--Ptolemaic and Copernican dialogue concerning the two chief world systems Dialogue concerning the two chief world systems 并列题名：Dialogue concerning the two chief world systems Dialogue Concerning the Two Chief World Systems