J-GLOBAL         Last updated: Nov 26, 2019 at 13:27
Hokkaido University
Slavic-Eurasian Research Center
Job title
Assistant Professor
PhD(The University of Tokyo on 24 September, 2015)
Research funding number


Yoichi Isahaya (PhD at The University of Tokyo in 2015) is currently an assistant professor of Eurasian studies at Hokkaido University. Previously, he was a postdoctoral fellow of the Japan Society for the Promotion of Science at Rikkyô University, and of the ERC project “Mobility, Empire and Cross Cultural Contacts in Mongol Eurasia” at the Hebrew University of Jerusalem. His research interest is in the exchange of knowledge in pre-modern Eurasia especially for the period of the Mongol empire (1206–1368) in the field of astral sciences. His publications include "Entangled Representation of Heaven: A Chinese Divination Text from a Tenth-Century Dunhuang Fragment (P. 4071)" (with Jyuh Fuh Lin, Historia Scientiarum 26/3 (2017): 153–171) and "The Tārīkh-i Qitā in the Zīj-i Īlkhānī: the Chinese Calendar in Persian" (SCIAMVS 14 (2013): 149–258). He is also the second author of the Thābit ibn Qurra’s Restoration of Euclid’s Data: Text, Translation, Commentary (with Nathan Sidoli, Cham: Springer, 2018).

Research Areas


Academic & Professional Experience

Apr 2019
Assistant Professor, Slavic-Eurasian Research Center, Hokkaido University
Apr 2018
Mar 2019
Post-Doctoral Fellow, College of Arts, Rikkyô University, Japan Society for the Promotion of Science
Apr 2018
Mar 2019
Part-Time Lecturer, College of Arts, Rikkyô University
Oct 2015
Dec 2017
Post-Doctoral Fellow, Department of Asian Studies, the Hebrew University of Jerusalem
Sep 2012
Dec 2012
Visiting Researcher, the Warburg Institute, the University of London


Apr 2008
Mar 2011
Department of Area Studies, Graduate School of Arts and Sciences, the University of Tokyo
Apr 2007
Mar 2008
Division of Human Social Dynamics, Graduate School of Humanities, Kobe University
Apr 2005
Mar 2007
Division of Human Cultural Dynamics, Graduate School of Humanities, Kobe University
Apr 2003
Mar 2005
Asian History, Faculty of Letters, Kobe University
Apr 2001
Mar 2003
College of Policy and Planning Sciences, School of Science and Engineering, the University of Tsukuba

Published Papers

Nathan SIDOLI & Yoichi ISAHAYA
Historia Mathematica   47 87-105   Apr 2019   [Refereed][Invited]
Takashi SUGA & Yoichi ISAHAYA
The Proceedings of the 5th Symposium on Astronomical Historical Records and Modern Science   252-277   Jan 2019
Entangled Representation of Heaven: A Chinese Divination Text from a Tenth-Century Dunhuang Fragment (P. 4071)
Yoichi ISAHAYA & Jyuh Fuh LIN
Historia Scientiarum   26(3) 153-171   Mar 2017   [Refereed]


Shi'en   79(2) 224-243   May 2019
Nazariyat: Journal for the History of Islamic Philosophy and Sciences   3(2) 199-203   Nov 2015   [Refereed][Invited]
INNER ASIAN STUDIES   29 135-145   2014   [Refereed]

Books etc

Voices of Three Generations: Essays in Honor of Seyyed Hossein Nasr
Yoichi ISAHAYA (Part:Joint Work, The Mongol Impact on Astronomy: The Differentiation of Astronomy in the Eastern and Western Islamicate World)
Kazi Publications   Aug 2019   ISBN:978-1567446777
Cet article met en perspective le système héliocentrique copernicien avec les évolutions décisives qui ont précédé sa genèse dans le monde islamique. Au XIIIième et XIVième siècle, la mesure du temps par des méthodes astronomiques (‘ilm al-mīqāt) ...
Marco Polo and the Silk Road (10th-14th Centuries)
Yoichi ISAHAYA (Part:Contributor, Sino-Iranica in Pax Mongolica: The Elusive Participation of Syriac-Rite Christians in the Ilkhanid Translation Project)
Peking University Press   Jun 2019   ISBN:9787301303283
Thābit ibn Qurra’s Restoration of Euclid’s Data
Nathan SIDOLI & Yoichi ISAHAYA (Part:Joint Work)
Springer   Sep 2018   ISBN:978-3319946603
This book provides a critical edition, translation, and study of the version of Euclid’s treatise made by Thābit ibn Qurra, which is the earliest Arabic version that we have in its entirety. This monograph study examines the conceptual differences...
Hiromitsu Yoshikawa et al. (Part:Joint Work, History in Future, Historians on Tomorrow: FromThe End of History to the Historiography of Inter-Subjectivity)
Ota shuppan   May 2017   ISBN:4778315766
Eleanor Robson, Jacqueline Stedall (Part:Joint Translation, Siyaq: Numerical Notation and Numeracy in the Persianate World)
Kyoritsu shuppan   May 2014   ISBN:4320110889

Conference Activities & Talks

Central Eurasian Studies Workshop in Hokkaido "The 14th-Century Crisis in Question: For Further Collaboration between Sciences and Humanities"   5 Oct 2019   
Project for the "14th-Century Crisis": The Current Status and Future Prospects [Invited]
19 Aug 2019   Earthquake Research Institute, University of Tokyo
Workshop for Slavic Studies in Hokkaido   12 Jul 2019   
The Sixth Conference of the School of Mamluk Studies   16 Jun 2019   The School of Mamluk Studies

Teaching Experience

  • Global History (Department of History, the College of Arts, Rikkyo University)
  • Persianate World (Department of History, the College of Arts, Rikkyo University)

Research Grants & Projects

Japan Society for the Promotion of Science: Grant-in-Aid for JSPS Fellows
Project Year: Apr 2018 - Mar 2019    Investigator(s): Yoichi ISAHAYA
An Analysis of Environmental History about the "14th Century Crisis"
Hokkaido University: 
Project Year: Apr 2019 - Mar 2020    Investigator(s): Yoichi ISAHAYA
Japan Society for the Promotion of Science: Grant-in-Aid for JSPS Fellows
Project Year: Apr 2011 - Mar 2014    Investigator(s): Yoichi ISAHAYA
Chinese Calendar in the Islamicate Astronomical Handbooks (Zījes)
Japan Society for the Promotion of Science/The University of Tokyo: The Institutional Program for Young Researcher Overseas Visits at the University of Tokyo
Project Year: Sep 2012 - Dec 2012    Investigator(s): Yoichi ISAHAYA
Japan Society for the Promotion of Science: Excellent Young Researcher Overseas Visit Program
Project Year: May 2010 - Mar 2011    Investigator(s): Yoichi ISAHAYA