Islam Museum Islam Museum islam.museum
Search ⌕ ARENUR
Accessibility
Text size 100%

Saved on this device only — nothing is sent anywhere.

The meridian measurement at Sinjār

قياس درجة الطول بسنجار

c. 827 CE · c. 212 AH† – c. 827 CE · c. 212 AH† †

† Hijri date derived by computation from the Gregorian/Julian date; it may differ from the transmitted date by a day or two.

Sinjar

Al-Khwārizmī joined al-Maʾmūn's project to fix the Earth's circumference by measuring the length of one degree of meridian across the plain of Sinjār in Iraq 1.

Depth

At a glance

Era
The Early Abbasid Caliphate
Region
Persia & Central Asia
Review
Draft Completeness 2/5 · Help complete it

In time

810820830840 c.
The Early Abbasid Caliphate

In space

Sinjar

Map: Natural Earth, public domain · places and route from the graph

The long-form text for this entry has not been written yet. The facts and connections below come from the museum's data.

Connections

Explore the connections

Had participant
al-Khwarizmi
Occurred at
Sinjar

People and things also explored

The Algebra composed· Sayf al-Dīn besieges his brother ʿImād al-Dīn at Sinjār — then flees before Saladin· The great flood of Sinjar, 511· Ṣūrat al-arḍ composed· Baghdad· al-Khwarizmi· Sinjar

Sources

  1. Al-Khwārizmī — Encyclopaedia Britannica
Cite this page

islam.museum contributors. “The meridian measurement at Sinjār”. islam.museum, https://islam.museum/en/event/meridian-degree-sinjar-827/. CC BY-SA 4.0. Last updated 2026-10-28.

Improve this page on GitHub · Report an error · JSON

Wing

Time

Eras, timelines, this day in history, any year in the Islamic world. Related

The Algebra composed

At the House of Wisdom in Baghdad under al-Maʾmūn, al-Khwārizmī composed his Algebra — rules and geometric demonstrations for solving linear and quadratic equations; its Latin translation gave Europe the word algebra.