as well an overview of anatomy and therapeutic procedures, Chapter Two: Is an overview of medical substances and their general properties, Chapter three : This chapter contains diagnosis and treatments of diseases known to a specific body part or Organ, Chapter four: covers conditions or diseases not specific to one part of the body, and finally chapter five: is over Compound remedies and their formulas. The second main researcher of the reign in expanding knowledge during the Islamic time period was Al-Riza, he is sometimes known in the Medieval period as the greatest physician of his time. Al-Riza created over two-hundred works and over half of those works are basically over medical knowledge. The most important work that Riza ever did was Kitab al-Hawi fi al-tibb or commonly known as The Comprehensive book of Medicine. This is considered one of his most important works because it was created by his personal medical notes collected throughout the years over everything he has read and observations of medical experience coming straight from his own eyes. The Kitab al-Hawi fi al-tibb is a collaboration of 23 volumes all pertaining different information, Each value goes into detail over specific diseases and parts of the body. There are many other important figures within this time period that further expanded the knowledge of medicine but Ibn-Sina and Al-Riza are acknowledged to be the most important figures of this time. Islamic astronomy Another huge area of expansion during the times of the 7th and 16th centuries was the topic of astronomy there many contributions made to astronomy during this time. There was a lot of previous known information before the start of research from many other places. The islamic people helped update the calculations and mathematics for measuring and calculating the movements of the plantes or "the heavenly bodies". This was not the only thing they were doing they also were updating models for the movement of the heavenly bodies. There were many people who contributed to these updates and other research but there are a few that really stuck out. Abd al-Rahman al-Sufi was one the most influential figures in improving the geometrical models of Ptolemy. Abd wrote Book of the Images of the Fixed Stars which described the forty-eight constellations formed by fixed stars. Abd al-Rahman al-Sufi was a very important figure because of the expansions he made in the world of Astronomy to this