:#The post-bear-eye era: Galileos observations of the Jupiter moons posed a problem for the ''philosophy'' of ''Plato'' and ''Aristotle'', the observation of the [http://www.youtube.com/watch?v=OlnlbZHP-jk phases of Venus] a problem for the ''Ptolemaic'' system. | :#The post-bear-eye era: Galileos observations of the Jupiter moons posed a problem for the ''philosophy'' of ''Plato'' and ''Aristotle'', the observation of the [http://www.youtube.com/watch?v=OlnlbZHP-jk phases of Venus] a problem for the ''Ptolemaic'' system. |