Scorpio is an astrological sign, which is associated with the constellation Scorpius. Under the tropical zodiac, Scorpio is occupied by the Sun from October 23 to November 22, and under the sidereal zodiac, it is currently from November 16 to December 15. The opposite sign to Scorpio is Taurus, and both signs are commonly known as the most sexually responsive of all zodiacal members. Scorpio is the eighth sign of the Zodiac and associated with intensity, passion, and power. Individuals born under this sign are thought to have a complex, analytical, patient, keenly perceptive, inquisitive, focused, determined, hypnotic, and self-contained character, but one which is also prone to extremity, jealousy, envy, secretiveness, possessiveness, cruelty and cunning. In terms of anatomy, Scorpio is said to rule the pelvis, reproductive system and urinary system. In terms of geography Scorpio is linked with Picardie, Navarre, El Salvador and Buryatia. Mediaeval astrologers believed that "By virtue of its tail armed with its powerful sting, the Scorpion creates natures ardent for war and active service, which rejoices in plenteous bloodshed and in carnage more than in plunder. When warfare is in abeyance, they find themselves foes to attack, there are those who enjoy mockfights and joust in arms and devote their leisure to the study of war and every pursuit which arises." Scorpio is traditionally thought to be ruled by the planet Mars, but in recent years many astrologers have labelled Pluto as the ruler or co-ruler, attributing the intensity associated with the sign to the planet's influence. In mythology Scorpio is often associated with Orpheus, from the Greek myth of Orpheus and Eurydice. Scorpio is also associated with the Greco-Roman gods Ares/Mars and also the god Hades/Pluto.