From the north pole, only the northern celestial hemisphere is visible, and from the south only the southern half of the sky. From both poles simultaneously, due to the phenomenon of atmospheric refraction at the very horizon, one can see celestial objects located at the celestial equator. The Sun may be such an object on the days of the equinoxes. However, the entire list is exhausted by the Sun. The moon, being near the celestial equator, will not be visible at any of the poles, since it will be below the horizon due to its parallax shift, which is twice the refraction value. Other objects in the celestial sphere are too faint to be observed at the very horizon at one of the poles, where at this time there will certainly be day. Even during a total solar eclipse, the sky near the horizon remains very bright.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.