... Castle and Sky . ... While Comet McNaught ruled southern skies, last week's conjunction of the Moon and Venus could be enjoyed by denizens of both hemispheres of planet Earth. ... A Comet Tail Horizon . ... To the surprise of many Northern Hemisphere observers, the tail of Comet McNaught remained visible even after the comet's head set ahead of the Sun. ... The Magnificent Tail of Comet McNaught . ... Comet McNaught, the Great Comet of 2007, has grown a long and filamentary tail. ...