A microlensing event as viewed from heliocentric SSB (orange) and true geocentric (purple) perspectives. We note that the heliocentric SSB frame is rectilinear while the true geocentric frame is noninertial. The separation, ∣u_⊙(t)∣ (top), and amplification, A(t) (bottom), illustrate the differences between u_0,⊙ and ﹩{{\boldsymbol{u}}}_{{\bf{0}},{\oplus }_{r}}﹩ and t_0,⊙ and ﹩{t}_{0,{\oplus }_{r}}﹩. The complete list of heliocentric SSB parameters for this event are α_L = 262﹩\mathop{.}\limits^{\unicode{x000b0}}﹩5, δ_L = −30°, t_0,⊙ = 60,000, M_L = 0.1 M_⊙, β = 0.1 mas, X_S,0,⊙ = [0.0, 0.1] mas, μ_L,⊙ = [0, 0] mas yr⁻¹, μ_S,⊙ = [3, 0] mas yr⁻¹, d_L = 3 kpc, d_S = 8 kpc, and b_sff = 1.0.