Since Antiquity Astronomers Have Counted 12 Zodiac Constellations

Since antiquity astronomers have counted 12 zodiac constellations. But during the past century this number has increased to 13. What caused this change?

A) Precession has caused the path of the Sun to shift against the background of the stars.
B) The boundaries of the constellations have been redefined.
C) Proper motions of stars have caused the constellations to shift.
D) New constellations have been invented within the past century.

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