Where armchair and observational cosmologists and physicist wannabes have fun and do real science and share lessons learned.
Sharing weekly blogs for over nine years. Click on archive or search box to find specific topic or any of more than nine years of individual posts to show and read more of the post and pictures
During a recent PBS show "Ancient Skies" the Ptolemaic view of the universe described the use of epicycles to correct for the retrograde motion of Mars. Can we go outside now and observe the motion?