Here's why:

* Scientific Method: Astronomy uses the scientific method to study celestial objects and phenomena. Astronomers observe, collect data, analyze it, and draw conclusions based on evidence.

* Mathematical Models: Astronomical theories are built on mathematical models that accurately predict celestial events, such as eclipses and planetary motions.

* Empirical Evidence: Astronomy relies on empirical evidence, such as observations from telescopes and space probes, to support its theories.

* Peer Review: Astronomical research undergoes peer review, ensuring its quality and validity.

Astrology, on the other hand, is not based on science. It lacks:

* Scientific Evidence: There is no scientific evidence to support the claims of astrology.

* Falsifiability: Astrological predictions are often vague and can be interpreted in multiple ways, making them difficult to test and falsify.

* Reproducibility: Astrological readings are not reproducible, meaning different astrologers can give different interpretations of the same birth chart.

* Empirical Basis: Astrology does not rely on empirical evidence or observations.

In summary, astronomy is a scientific discipline that studies the celestial objects and phenomena, while astrology is a system of beliefs that claims to predict human affairs based on the positions of celestial bodies.