τ ή ρ , ▁plan ē t ē s ▁ast ē r ), ▁which ▁we ▁know ▁as ▁the ▁plan ets ▁of ▁the ▁solar ▁system . ▁ ▁Ast ro log y ▁also ▁tre ats ▁the ▁Sun , ▁a ▁star , ▁and ▁Earth ' s ▁Moon ▁as ▁if ▁they ▁were ▁plan ets ▁in ▁the ▁hor os cope . ▁ ▁These ▁stars ▁were ▁called ▁" fixed " ▁because ▁it ▁was ▁thought ▁that ▁they ▁were ▁attached ▁to ▁the ▁firm ament , ▁the ▁most ▁distant ▁from ▁Earth ▁of ▁the ▁heaven ly ▁spher es . ▁ ▁Stars ▁and ▁ast ro log ical ▁degrees ▁C ertain ▁of ▁the ▁ast ro log ical ▁degrees ▁were ▁identified ▁and ▁known ▁due ▁to ▁their ▁association ▁with ▁a ▁corresponding ▁star . ▁ ▁The ▁ast ro log ical ▁degrees ▁that ▁correspond ▁to ▁individual ▁stars ▁must ▁be ▁corrected ▁for ▁the ▁pre cess ion ▁of ▁the ▁equ ino xes , ▁and ▁as ▁such ▁the ▁ast ro lo ger ▁must ▁know ▁when ▁any ▁given ▁position ▁of ▁a ▁fixed ▁star ▁was ▁noted , ▁to ▁make ▁the ▁necessary ▁corre ctions . ▁ ▁Stars ▁in ▁sid ere al ▁and ▁tropical ▁ast ro log y ▁Trad itional ▁Western ▁ast ro log y ▁is ▁based ▁on ▁tropical ▁ast ro log y , ▁which ▁pres umes ▁an ▁equal ▁division ▁of ▁the ▁cel est ial ▁sphere ▁along ▁the ▁e cli ptic ▁into ▁twelve ▁equal ▁parts , ▁starting ▁with ▁A ries . ▁ ▁Sid ere al ▁ast ro log y , ▁at ▁once ▁the ▁oldest ▁and ▁a ▁recently ▁rev ived ▁ast ro log ical ▁tradition , ▁is