Shoreshthe drift report · all case files
Case file

Al-Biruni

In 2005 Wikipedia's first sentence called it “persian mathematician”. Today it says “khwarazmian iranic scholar and polymath during the islamic golden age”.
Measured, not asserted. Every count, date and revision on this page was taken from Wikipedia's own history and checked against the live article. The words quoted are theirs.
Machine-checked against the full current article on 2026-08-03.
We saved snapshots of this article over twenty years; you are reading the 2005 one. Red dashes: removed from Wikipedia since. Pale dots: rewritten; the numbered note shows what it says now. 1 tap a number or a side note to jump between them
The opening as it read in 2005

Biruni commemorated on a Soviet stamp for his millennial anniversary. Abu Raihan Al-Biruni (also, Biruni , Alberuni Persian : ابوریحان بیرونی) ; Arabic : أبو الريحان البيروني; ( September 15 , 973 - December 13 , 1048 ) was a Persian mathematician , astronomer , physicist , scholar , encyclopedist , philosopher , astrologer , traveller , historian , pharmacist and teacher , of Central Asian origin, who contributed greatly to the fields of mathematics , philosophy , medicine and science . He was born in Khwarazm Persia, presently in Uzbekistan , but then within the borders of Persian Empire . He studied mathematics and astronomy under Abu Nasr Mansur . He was a colleague of the Persian philosopher and physician Ibn Sina , the historian, philosopher and ethicist Ibn Miskawayh , in a university and science center established by prince Abu Al Abbas Ma'mun Khawarazmshah. He also travelled to India with Mahmud of Ghazni and accompanied him on his campaigns there, learning the language, and studying their religion and philosophy, and wrote Ta'rikh al-Hind ("Chronicles of India"). He also knew the Greek Language , and possibly Syriac and Berber . He wrote his books in Persian (his native tongue) and Arabic . Some of his notable achievements included: At age 17, he calculated the latitude of Kath, Khwarazm , using the maximum altitude of the sun . By age 22, he had written several short works, including a study of map projections , " Cartography ", which included a methodology for projecting a hemisphere on a plane , . By age 27, he had written a book called " Chronology " which referred to other work he had completed (now lost) that included one book about the astrolabe , one about the decimal system , four about astrology , and two about history . He calculated the radius of the Earth to be 6,339.6 km (this result was replicated in the West in the 16th century ). His contributions to mathematics include: theoretical and practical arithmetic summation of series combinatorial analysis the rule of three irrational numbers ratio theory algebraic definitions method of solving algebraic equations geometry Archimedes ' theorems trisection of the angle His non mathematical works include: Critical study of what India says, whether accepted by reason or refused (Arabic تحقيق ما للهند من مقولة معقولة في العقل أم مرذولة) - a compendium of India's religion and philosophy The Remaining Signs of Past Centuries (Arabic الآثار الباقية عن القرون الخالية) - a comparative study of calendars of different cultures and civilizations, interlaced with mathematical, astronomical, and historical information. The Mas'udi Canon (Arabic القانون المسعودي) - a book about Astronomy, Geography and Engineering, named after Mas'ud, son of Mahmud of Ghazni, to whom he dedicated Understanding Astrology (Arabic التفهيم لصناعة التنجيم) - a question and answer style book about mathematics and astronomy, in Arabic and Persian Pharmacy - about drugs and medicines Gems (Arabic الجماهر في معرفة الجواهر) about geology, minerals, and gems, dedicated to Mawdud son of Mas'ud Astrolabe A historical summary book History of Mahmud of Ghazni and his father History of Khawarazm1

This is Wikipedia's own text, saved in our repository. Their copy of it is revision 16145922.
Today
In 2005 Wikipedia's first sentence called it “persian mathematician”. Today it says “khwarazmian iranic scholar and polymath during the islamic golden age”. Read the current article and compare.
2005201020152020Oct '232025
Counts in the opening at each snapshot. Green: the word gained ground. Red: it was cut. Grey: no change.

What Wikipedia says this is

Every article opens by defining its subject. This one was redefined since 2005, and today's defining sentence is their current revision.

Then

persian mathematician

Now

khwarazmian iranic scholar and polymath during the islamic golden age

Struck red text is no longer in the article; dotted amber text was rewritten. Every revision id links to Wikipedia's copy; the text shown is our own saved copy. Data: /data. Wikipedia text is CC BY-SA; quoted for the record; not affiliated with Wikipedia.

← back to the drift report