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Background- al-Battani was born in Harran and his family members were apart of the Sabian sect a religious sect of star worshippers. Despite coming from a religious background and considered Muslim he was not a believer in the Sabian religion.

The Sabians had a strong motivation for studying astronomy, producing math great astronomers and mathematicians. al-Battani's father happened to be an astronomer and he learned many skills from him before continuing to study the subject as a life career.

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- Cataloged around 489 stars in the night sky

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Kitab al Zij was al-Battani's one of the most important works in all of medieval Islam. His astronomic work would later influence great minds such as Galileo and Copernicus. It would also contribute to technological advancements later and the knowledge found would be considered of great value towards education and religion.

Here are some of the things the Zij contained.

- Found the Sun's orbit was central but incomplete (which also proved eclipses of the Sun were possible

- Contained planetary, lunar and solar tables

- refined existing values for years (being 365 days, 5 hours, 46 minutes and 24 seconds), seasons and equinoxes

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-al-Battani used trigonometric calculations to improve Ptolemys astronomical calculations about the irregular path between the Sun, Moon and planets circular motions around the Earth.
- used trigonometric tables in his work towards astronomy
- Made a trigonometric equation for right angles --> bsin(A)=asin(90°−A)