Young effect computed along Venus’s equator on the morning hemisphere for solar-zenith angles γ = [85π/180, π/2 + ρ_⊙]. The black dashed line indicates the Young effect in the case the Sun is above the horizon Eq. (7). The plain red line corresponds with the case of the rising Sun Eq. (8). The vertical line indicates the first contact of the Sun with the horizon. The minimum value of ΔV_Y is −2000 m s⁻¹ corresponds with the Sun’s equatorial velocity V_eq used for the simulation.