Jamshid Ibn Mas’oud Kashani, celebrated astronomer and mathematician (1387 – 1429), from Kashan. His father was a physician. He wrote in Persian and in Arabic. Ghiyath al-Din gives a description of the tests undergone by poets when they were admitted to the sovereign’s court. He also assisted in the establishment of Ulugh Beg’s (Timurid ruler in Samarqand; b. 1933, ruled. 1447 – 1449) astronomical tables, and established the value of pi with extraordinary exactitude.

####Works:

1- Khaghani astronomical table

2- Tasilat astronomical table

3- Treatises “Chord” and “Sine” (on mathematics and geometry)

4- The dimensions and bodies

5- Treatise “Circumference”

6- Treatise on “the dimensions of the earth and the stars”, etc.

His books and astronomical tables are kept in the famous libraries in the world.

### Dehkhoda dictionary

### Farsi encyclopedia

https://tahoor.com/en/Article/PrintView/117269