A coordinate question
One sky, two zodiac systems
Which zodiac section contains the Sun?
Here, sign means one of twelve equal coordinate sections along the zodiac. Imagine the Sun’s apparent yearly path as a circular track around the sky. The zodiac divides a band around that path into twelve equal signs.
Same Sun · different starting points
The two systems divide the same circle into the same twelve equal signs.
Begins at a seasonal marker: the March equinox. Its zero point therefore stays tied to the seasonal year.
Begins from a point defined relative to the stars. Sidereal zodiac systems are commonly used in Indian astronomical and calendar work. Each Indian sidereal sign is called a rāśi.
The diagram marks one representative sidereal starting point. Different documented sidereal systems may place that zero point slightly differently.
The angle between those two starting points has a Sanskrit name: ayanāṃśa →, where those choices are explained.