The Signs don't change positions with respect to each other, but because the Earth rotates once every 24 hours, a different Sign appears to rise in the East about every 2 hours and then slowly cross the night sky until it disappears below the horizon in the West. If you have ever seen a view of the night sky recorded with time-lapse photography and then speeded up, you'd have seen all the stars move across the sky at the same rate as the Earth turns
But some of those "stars" actually do move a little in relation to the others, and they were called "wandering stars". They are actually the moving Planets we can see with the naked eye, from Mercury out to Saturn. The word "planet" originally meant "wandering star". In the Christian and Hebrew holy books, the word "star" usually refers to one of these "wandering stars" which we would call "planets" in the English language of our time period. Because the Sun's light is reflected from the Planets, they appear to us as bright as the stars in the sky
You might find it interesting that in the Book of Genesis, Chapter 1, Verse 14, God is said to have made the sun and moon and stars "for signs" on the fourth day of Creation. For thousands of years, astrologers have been doing just that - looking "for signs" in the heavens as a way of understanding what is happening, or will happen, on Earth. Sometimes I wonder if the people who quote the Bible to condemn Astrology have ever read what is on the first page? It says God made these heavenly bodies to show us "signs" of His intentions, and those signs are there for anyone to read - if they would only learn how to interpret them. That is what Astrology is all about, and why Kings and Popes have consulted Astrologers, also called Magi (wise men) or Chaldeans (many were from the land called Chaldea), throughout the entire recorded history of mankind.
The Signs, as far as we can tell, originated as symbols or imaginary figures seen in the patterns of stars in the night sky. Today they retain their same symbolic meanings, even if many astrologers no longer assume the Signs are the same as the images ancient men saw in those star patterns over 5000 years ago. It is these symbols, and not the stars, that help us understand the relationship between the motion of planets and the motivations of people.