— changing light visible position on the celestial sphere, finitude is due to the speed of light and movement of the observer and a result movement of the Earth in outer space. There are age aberration of light,caused by the motion of the Solar system in the Galaxy, year — movement of the Earth in its orbit around the Sun, the daily — the actual rotation of the Earth. Most significant in size — annual aberration of light, discovered in $1725$ by the English scientist James Bradlyeyem $(1693-1762)$.