ric ▁field ▁of ▁vision ▁in ▁modern ▁times ▁provided ▁a ▁d ile m ma ▁for ▁ast ro log ers , ▁which ▁most ▁eventually ▁resolved ▁by ▁a ▁cons ensus ▁declaring ▁U ran us ▁to ▁be ▁Aqu arius ' ▁r uling ▁planet ▁while ▁assigning ▁Ne pt une ▁to ▁P is ces ▁and ▁later , ▁Pl uto , ▁considered ▁the ▁higher ▁oct ave ▁of ▁Mars , ▁was ▁given ▁to ▁Sc or pio . ▁ ▁Some ▁modern ▁authorities ▁use ▁the ▁concept ▁of ▁" night ▁r ul ers hips " ▁to ▁find ▁room ▁for ▁the ▁additional ▁dign ities . ▁U ran us ▁was ▁designated ▁the ▁day ▁r uler ▁of ▁Aqu arius ▁while ▁Sat urn ▁was ▁to ▁be ▁its ▁night ▁r uler . ▁Similarly , ▁Ne pt une ▁was ▁the ▁day ▁r uler ▁of ▁P is ces , ▁leaving ▁Jup iter ▁as ▁the ▁night ▁r uler , ▁and ▁Pl uto ▁was ▁the ▁day ▁r uler ▁of ▁Sc or pio ▁with ▁Mars ▁as ▁the ▁night ▁r uler . ▁This ▁notion ▁probably ▁had ▁its ▁origin ▁in ▁the ▁concept ▁of ▁ast ro log ical ▁sect , ▁but ▁this ▁was ▁the ▁only ▁vest ige ▁of ▁the ▁sect ▁in ▁the ▁modern ▁tradition . ▁Unfortunately , ▁no ▁allow ance ▁was ▁made ▁for ▁these ▁modern ▁suggestions ▁in ▁the ▁complex ▁traditional ▁doctrine ▁of ▁essential ▁dign ities , ▁but ▁the ▁idea ▁was ▁very ▁popular . ▁ ▁The ▁use ▁of ▁dual ▁r ul ers hips ▁in ▁a ▁manner ▁such ▁as ▁this ▁was ▁also ▁be ▁known ▁as ▁" co - r ul ership ". ▁Some ▁ast ro log ers ▁believed ▁that