Which Happened First?

Guo Shoujing

Guo Shoujing
Image: Shizhao · CC BY 2.5 · source

Guo Shoujing, courtesy name Ruosi (若思), was a Chinese astronomer, hydraulic engineer, mathematician, and politician of the Mongol Empire and Yuan dynasty.

Summary from Wikipedia (CC BY-SA 4.0) · Dates from Wikidata (CC0)

Who was born first?

Timeline

  1. Alfonso X of Castile and LeonNovember 23, 1221 – April 4, 1284
  2. Vitellocirca 1230 – circa 1275
  3. Guo Shoujing (this page)1231–1316
  4. Qutb al-Din al-ShiraziOctober 1236 – February 7, 1311
  5. Yang Huicirca 1238 – circa 1298
  6. Petrus Peregrinus de Maricourtcirca 1240 – 14th century

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