Evolution of a Venus-like planet with an initial rotation of 100 days for three initial eccentricities (i.e., the null eccentricity, and the 0.1 and 0.2 eccentricities). The top panel shows the evolution of the planet rotation rate in terms of Ω/n (Ω and η are the spin and mean motion, respectively). The bottom panel shows the variation in eccentricity Δe (i.e., (e − e(0))/e(0)).