The same birth moment reads differently in the two traditions. Here is why.
One sky, two starting lines
Western astrology starts the zodiac at the March equinox, the day when light and dark are equal. Vedic astrology starts it against the fixed stars. About 1,700 years ago the two lines matched. The equinox has drifted slowly ever since, and today the two zodiacs sit about 24° apart.
What that does to your chart
Each sign is 30° wide. A shift of 24° moves about four placements in five back by one sign. A Western Sun at 3° Leo becomes a Vedic Sun in Cancer. A Western Sun at 27° Leo stays in Leo.
What stays the same
The planets are in the same place in the sky. The angles between them are the same in both charts. Only the names of the signs behind them change, and with the rising sign, the houses.
Which one is right?
Neither is wrong. They are two languages, each built over centuries on its own rules. Western astrology ties the signs to the seasons. Vedic astrology ties them to the stars and adds its own tools: the 27 nakshatras, the lunar nodes Rahu and Ketu, and the dasha periods of a life. Unseen Signs shows both, so you can see where they agree and where they part.
The settings used here
Western: the tropical zodiac. Vedic: the sidereal zodiac with the Lahiri ayanamsa, the standard of India’s national calendar. Both charts use whole-sign houses. Rahu and Ketu use the mean lunar node.