Tropical vacations for Image credit Atlas Van Stolk Collection, Rotterdam, www.collectie.atlasvanstolk.nl inventory no Similarly, New Testament scholar Craig Keener writes, Without a tail extending as suggested in some modern artistic portrayals of the event, a celestial light could have pointed them only in the most general way or by symbolic means. For a comet to develop a long tail in the run-up to perihelion and particularly in the period after it, due to the increase of degassing, is, of course, normal. In addition, it is common for comets to set coma-down and tail-up, because their tail always points away from the Sun. Depending on the location of the comet with respect to the Sun and Earth and on the season, it is perfectly possible for a comet’s tail to stand up vertically or near-vertically. Tropical vacations 2016.