- 1195 Births: Pope Urban Iv, Pope Clement Iv, Anthony of Padua, Xia Gui, Johannes de Sacrobosco, Roger de Quincy, 2nd Earl of Winchester
- Johannes de Sacrobosco: An entry from Gale's <i>Science and Its Times</i> by Judson Knight, 2001
- 1256 Deaths: Jacob Anatoli, William Ii of Holland, Kujo Yoritsune, Alice de Lusignan, Countess of Surrey, Johannes de Sacrobosco, Sartaq Khan
- Sphaera Mundi by Johannes de Sacrobosco, 1482-01-01
- Joannis De Sacrobosco: Sphaera (1647) (Latin Edition) by Johannes De Sacrobusco, 2009-07-17
- Joannis De Sacrobosco: Sphaera (1647) (Latin Edition) by Johannes De Sacrobusco, 2010-09-10
- Joannis De Sacrobosco: Sphaera (1647) (Latin Edition) by Johannes De Sacrobusco, 2010-09-10
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