I see no one has taken the time to mention the difference between "sign" of the Zodiac and "constellation" of the Zodiac, esp. with so many people from India here. They (signs and constellations of the Zodiac) are both 12 in total and with the same names but do not coincide in position. They are about 23 degrees off.
Vedic astrology uses the Sidereal Zodiac whereas "western" astrology uses the "Tropical" zodiac. The first is measured starting from some star or point presumably in the
constellation Aries, while the latter starts (it's 0 degree point in the Ecliptic is) the start of spring, which is
defined as 0 degrees of the
sign Aries.
But who's counting...