Issue 2.2 of our new series Aestimatio: Sources and Studies in the History of Science is now online.

It is freely accessible. In it, readers will find:

Sources

C. Philipp E. Nothaft, Astronomical Shoptalk in Paris, ca 1246: An Edition and Translation of John of London’s Letter to R. de Guedingue

Studies

Lis Brack­-Bernsen, Babylonian House Numbers and Squares of Zodiacal Signs: The Origin of the Quadruplicities, Part I

Sonja Brentjes, The Stars in the Sky and on the Globe: ʿAbd al-Raḥmān ibn ʿUmar al-Ṣūfī’s Visualization of the Heavens

and 12 reviews of recent publications in the field.