The proper motion of stars is revealed as a result of long-term observations. Which celestial bodies proper motion can be observed directly?
The proper motion of the moon when viewed through a telescope with a magnification of 500-1000 times. Movement of meteoric bodies in the Earth’s atmosphere. Own movement of artificial satellites.
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.