excentricité
1988 / The division of the Martian eccentricity from Hipparchos to Kepler: A history of the approximations to Kepler motion / James Evans / American Journal of Physics 56 (1988) p. 1009 [doi]
2012 / The Eccentricity of the Sun: Kepler's Novel Method of Calculation / Yaakov Zik ; Giora Hon / Journal for the History of Astronomy 43 (2012) p. 181 [lien]