▁more ▁observation ally ▁orient ed ▁and ▁uses ▁the ▁actual ▁observed ▁position ▁of ▁the ▁stars ▁and ▁the ▁traditional ▁divisions ▁of ▁the ▁z od iac ▁const ell ations ▁as ▁its ▁starting ▁point . ▁ ▁As ▁a ▁result ▁of ▁the ▁pre cess ion ▁of ▁the ▁equ ino xes , ▁the ▁observed ▁positions ▁of ▁the ▁z od iac ▁signs ▁no ▁longer ▁correspond ▁to ▁the ▁signs ▁of ▁tropical ▁ast ro log y . ▁ ▁Z od iac ▁Trad itionally , ▁the ▁most ▁important ▁fixed ▁points ▁in ▁the ▁heav ens ▁were ▁described ▁by ▁the ▁const ell ations ▁of ▁the ▁z od iac . ▁P to le my ' s ▁account ▁lik ens ▁the ▁influence ▁of ▁some ▁of ▁the ▁stars ▁in ▁the ▁z od iac ▁const ell ations ▁to ▁the ▁plan ets ; ▁he ▁writes , ▁for ▁example , ▁that ▁" The ▁stars ▁in ▁the ▁feet ▁of ▁Gem ini ▁( Al h ena ▁and ▁Te j at ▁Post er ior ) ▁have ▁an ▁influence ▁similar ▁to ▁that ▁of ▁Mercur y , ▁and ▁moder ately ▁to ▁that ▁of ▁Ven us ." ▁ ▁Non - z od iac ▁const ell ations ▁in ▁ast ro log y ▁Viv ian ▁E . ▁Rob son ▁notes ▁that ▁many ▁of ▁the ▁traditional ▁const ell ations ▁outside ▁of ▁the ▁z od iac ▁const ell ations ▁occup y ▁large ▁degrees ▁of ▁arc ▁and ▁typically ▁comp ass ▁several ▁of ▁the ▁tropical ▁z od iac ▁signs . ▁ ▁P to le my ▁referred ▁to ▁stars ▁by ▁reference ▁to ▁the ▁an atom y ▁or ▁parts ▁of ▁the ▁const ell ations ▁in