Ibn Yūnus

Also found as Ibn Yunus

Ibn Yunus was an astronomer who made observations over many years.

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A sky notebook kept for years

Ages 7–9

Ibn Yunus was an astronomer who made observations over many years.

The book describes nearly thirty years of observations beginning in 977.

He observed with an astrolabe described as nearly 1.4 meters across.

1001 Inventions reports more than 10,000 entries about the Sun’s position in his observations.

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Find Ibn Yunus in our books

Use the printed page in a physical book, or the PDF page in your copy. Open a reference for the surrounding text.

1001 Inventions

Edited by Salim T. S. al-Hassani

4 reading locations

Printed p. 89 PDF p. 92Reading page

“…his work. As well as Al-Battani, Abu alWafa', Ibn Yunus, and Ibn al-Haytham also developed spherical trigonometr y and applied it to the solution of astronomical problems. Al-Battani was the fi.rst to use…”

Text around a matching name in the supplied edition. Extraction may retain spelling or spacing errors.

Printed p. 228 PDF p. 231Reading page

“…annum, or 23,841 years for a complete rotation. Ibn Yunus, who died in 1009, said it was 1° in 70 years, or 51.43 seconds per annum, or a rotation in 25,175 years. This…”

Text around a matching name in the supplied edition. Extraction may retain spelling or spacing errors.

Printed p. 267 PDF p. 270Reading page

“…but only six astronomical writings have survived. • Ibn Yunus made obser vations for nearly 30 years from 977 using a large astrolabe nearly 1.4 meters (4.6 feet ) in diameter. He recorded…”

Text around a matching name in the supplied edition. Extraction may retain spelling or spacing errors.

Printed p. 315 PDF p. 318Biographical entry

“…Gr anada, Spain; philosopher , physician, and politician. Ibn Yunus, Abu'l-Hasan Ali ibn Abd al-Rahman ibn Ahmad al-Sadaf:t (950-1009); Fustat, Cairo, Egypt; mathematician and astro nomer who compiled the Hakemite Tables. Ibn Zuhr,…”

Text around a matching name in the supplied edition. Extraction may retain spelling or spacing errors.

FROM THE RESEARCH ARCHIVE

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Astronomical observations, trigonometric calculations of time, and records of eclipses.

This summary comes from the collected Islamic Scientific Heritage posts. It has not been independently verified in full. A book name match alone does not confirm every claim in a post.

Research note: The posts vary in their account of his family and chronology.

34 original research posts

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