In the opinion of knowledge
In the opinion of Islamic acknowledged men. Knowledge of stars is a mathematics and is separate from study of vanishes.
As a doctor gets information about stomach from color or pulse. In such a way astronomies get information from the dirt of stars.
For example umar khyam had bury joza Mercury was at 8th ranking. Star stern was at ease to see them. Because of it he was intelligent.
A religious acknowledge man represent a Fatva and ask the people to show its replaceable. The Imam masjid does not clean after stoll. Then say it is able for imamat. Another imam has faith in Rasul-e-Pak presence in the Mehfil-e-Nat and also makes and attest the indications of astrologist it is able for imamat.
Two give Tagzia is a great sin near Muslims. It was presence of other with Allah like shirk. Imamt is not fair of this person to take the presence of Rasul-e-Pak in Mehfil. Now there is not a people.
Because of the levels their value is known and indeed the man who has better knowledge of these things he can explain letter about them and that agency the value these things better and the other man cannot do it. If he will try to do so he will be on wrong and its impressions will be negative.
The man who has this knowledge is known as jewelers and for it example is famous that value of a stone is known by a jeweler. As the value of diamond stone is known by a jeweler.