Three examples of ancient "universal" portable sundials [chapter]

Denis Savoie
2020 Zenodo  
Instruments – Observations – Theories: Studies in the History of Astronomy in Honor of James Evans, ed. Alexander Jones and Christián Carman, 2020, DOI: 10.5281/zenodo.3928498, pp. 45–77.
doi:10.5281/zenodo.3975719 fatcat:wavlu2lzovaxzhfh6q5sgja4l4