</s> ▁Econom y ▁is ▁an ▁un in cor por ated ▁community ▁in ▁Ma con ▁County , ▁in ▁the ▁U . S . ▁state ▁of ▁Missouri . ▁ ▁History ▁ ▁Econom y ▁was ▁originally ▁called ▁Vienna , ▁and ▁under ▁the ▁latter ▁name ▁settlement ▁was ▁made ▁in ▁the ▁ 1 8 3 0 s . ▁The ▁present ▁name ▁rec alls ▁the ▁econom ical ▁de als ▁to ▁be ▁had ▁at ▁a ▁local ▁store . ▁A ▁post ▁office ▁called ▁Vienna ▁was ▁established ▁in ▁ 1 8 5 4 , ▁the ▁name ▁was ▁changed ▁to ▁Econom y ▁in ▁ 1 8 5 6 , ▁and ▁the ▁post ▁office ▁closed ▁in ▁ 1 9 0 6 . ▁ ▁References ▁▁ ▁Category : Un in cor por ated ▁communities ▁in ▁Ma con ▁County , ▁Missouri ▁Category : Un in cor por ated ▁communities ▁in ▁Missouri <0x0A> </s> ▁In ▁astronom y , ▁magnitude ▁is ▁a ▁unit less ▁measure ▁of ▁the ▁bright ness ▁of ▁an ▁object ▁in ▁a ▁defined ▁pass band , ▁often ▁in ▁the ▁visible ▁or ▁inf ra red ▁spectrum , ▁but ▁sometimes ▁across ▁all ▁w avel ength s . ▁An ▁im prec ise ▁but ▁system atic ▁determ ination ▁of ▁the ▁magnitude ▁of ▁objects ▁was ▁introduced ▁in ▁ancient ▁times ▁by ▁Hi pp arch us . ▁ ▁The ▁scale ▁is ▁log arith mic ▁and ▁defined ▁such ▁that ▁each ▁step ▁of ▁one ▁magnitude ▁changes ▁the ▁bright ness ▁by ▁a ▁factor ▁of ▁the ▁fifth ▁root ▁of ▁ 1 0 0 , ▁or ▁approximately ▁ 2 . 5 1 2 . ▁For ▁example , ▁a