Sedona, AZ: Evening Sky Tours is preparing to welcome Comet Hartley to the observation list for nearly one month beginning on September 27.  The short period comet, 6.5 years, will pass within 11 million miles of the Earth on October 20, which is only eight days before coming to perihelion (closest approach to the sun) on October 28. “We will be observing Comet Hartley every night beginning on...