The recent outburst of activity in ISON has helped to dispel some of the fears that this comet will turn out to be a dud, and it still has plenty of potential to put on a spectacular display in December, as it emerges from its close encounter with the Sun expelling large amounts of dust and gas from the melting ice of its nucleus. Given that ISON is a "sun-grazing" comet, and that its course will bring it perilously close to to the Sun, there is a strong chance that it will break up during perihelion, before the full potential of its display is realised. If it emerges from perihelion intact however, it will have the potential to be one of the greatest comets of the 21st century. During perihelion on Nov 28th, when it makes its closest approach to the Sun, ISON will be practicably unobservable from earth, and will not be seen again until it emerges from the Sun's glare in early to mid December, and theoretically, it should be at its most impressive state when it makes it closest approach to earth on 26th December - the feast of St. Stephen, the first Christian martyr.
If it does indeed put on its greatest display at this time, it will be tempting to link this the victims of the Boxing Day tsunami of 2004, that took place on this exact date, and which I believe was connected in some way with the Signs in the Sky that appeared during the turn of the millennium, and may foreshadow events to come:
“And there will be signs in sun and moon and stars, and on the earth distress of nations in perplexity because of the roaring of the sea and the waves, people fainting with fear and with foreboding of what is coming on the world. For the powers of the heavens will be shaken". (Luke 21:25-26)