Card 18 shows:

"Part of the constellation of Ophiuchus, the God of Healing who holds the serpent of medicine and rebirth, lies between Scorpio and Sagittarius on the zodiac band. Like the God of Healing, who was slain with a lightning bolt and then vanished to the underworld, before being resurrected and placed amoungst the stars, this constellation disappears beneath the horizon every Autumn and is resurrected- reappears- each Spring... "

Tennant 1995:card 18