The Talmud famously says that the Jewish people calculate our calendar by the moon (lunar calendar), and the Nations of the World use the sun (solar calendar). How is this understood as far as the Arab/Muslim calander which is lunar, and likewise the Chinese calander, which uses the moon? If, however, these peoples are an exception to the rule, why so? (I heard there is a Maharal about this, but I don't know where.)