Fig. 6From: Reachable set analysis of practical trans-lunar orbit via a retrograde semi-analytic modela The distribution of the design variables: \(\lambda\) vs. \(\varphi\). b The distribution of the design variables: \(\lambda\) and \(\varphi\) vs. \(v_{{{\text{prl}}}}\). c The distribution of the design variables: \(\lambda\) and \(\varphi\) vs. \(i_{{{\text{prl}}}}\). d The inclination and LAN in LVLH frame and LCF frameBack to article page