Introduction to invivo
The Antarctic horse is invivo, which is considered as the current Polaris relative to Polaris. For an observer in the southern hemisphere, the Antarctic σ is almost motionless, and all the stars in the southern sky seem to revolve around it. It is a small semi-hexagon, part of the ladder, only 1 degree away from the real South Pole, but because of precession, the South Pole of the celestial sphere is gradually moving away.
Although the Antarctic constellation σ is often called the north star in the south, the official will never agree with this name, even if the term is invented in modern times.