▁before ▁a ▁departure ▁at ▁minute ▁ 0 . ▁Sh orter ▁cycles ▁have ▁additional ▁symmetry ▁minutes , ▁shift ed ▁by ▁half ▁the ▁cycle ▁time . ▁So ▁an ▁hour ly ▁cycle ▁has ▁symmet ries ▁at ▁minutes ▁ 2 8 ½ ▁and ▁ 5 8 ½ , ▁a ▁ 3 0 - min ute ▁cycle ▁has ▁symmet ries ▁at ▁minutes ▁ 1 3 ½ , ▁ 2 8 ½ , ▁ 4 3 ½ ▁and ▁ 5 8 ½ , ▁and ▁so ▁on . ▁ ▁The ▁following ▁table ▁shows ▁the ▁departure ▁times ▁in ▁opposite ▁directions ▁for ▁an ▁hour ly ▁cycle , ▁using ▁the ▁ 5 8 ½ ▁symmetry ▁minute ▁( the ▁most ▁common ▁in ▁Central ▁Europe ). ▁The ▁other ▁departure ▁times ▁for ▁shorter ▁cycles ▁can ▁be ▁calculated ▁from ▁it . ▁The ▁last ▁line ▁gives ▁the ▁meeting ▁times . ▁▁▁▁ ▁Category : Transport ation ▁planning ▁Category : Sch ed uling ▁( transport ation ) <0x0A> </s> ▁A ▁low ▁sod ium ▁di et ▁is ▁a ▁di et ▁that ▁includes ▁no ▁more ▁than ▁ 1 , 5 0 0 ▁to ▁ 2 , 4 0 0   m g ▁of ▁sod ium ▁per ▁day . ▁ ▁The ▁human ▁minimum ▁requirement ▁for ▁sod ium ▁in ▁the ▁di et ▁is ▁about ▁ 5 0 0   m g ▁per ▁day , ▁which ▁is ▁typically ▁less ▁than ▁one - six th ▁as ▁much ▁as ▁many ▁di ets ▁" season ed ▁to ▁taste ". ▁For ▁certain ▁people ▁with ▁salt - sens itive ▁blood ▁pressure ▁or ▁dise ases ▁such ▁as ▁Mé ni ère '