The comet is crossing through the middle of Orion, making a beeline toward Sirius, and thus gradually moving out of twilight. Magnified views reveal a gas tail, several degrees long, standing nearly vertically above the horizon. In Italy Study the great extinction boundary with experts during a 12-day expedition based at Coldigioco Geological Observatory in Italy. Visit outstanding outcrops, including Gubbio. Send FAX to 334 844-4486 to request application.
Participants arrange own transportation.
This works because, we are told, there are more rods slightly off the optical axis of our eyes. But there is a great deal more to it than that, and with some understanding of the physiology of the eye, it will be seen that there are right and wrong ways to use averted vision. It is true that the density of rods peaks well outside the center of vision. Since the rods are the eye's faint light detectors, it stands to reason that this peculiarity of physiology is what makes averted vision work. The density of the rods at a point 20 degrees off the center of vision reaches about 160,000 rod cells per square millimeter.