ation ▁with ▁respect ▁to ▁the ▁rotation ▁of ▁the ▁central ▁body , ▁whereas ▁the ▁− ▁sign ▁is ▁for ▁counter - rot ation . ▁That ▁is , ▁if ▁the ▁satellite ▁or bits ▁in ▁the ▁same ▁direction ▁as ▁the ▁planet ▁sp ins , ▁it ▁takes ▁more ▁time ▁to ▁make ▁a ▁full ▁orbit , ▁whereas ▁if ▁it ▁moves ▁oppos it ely ▁with ▁respect ▁to ▁the ▁planet ' s ▁rotation ▁its ▁orb ital ▁period ▁gets ▁shorter . ▁ ▁See ▁also ▁ ▁Introduction ▁to ▁general ▁relativ ity ▁Gra v it om agnet ic ▁time ▁delay ▁ ▁References ▁▁ ▁Category : C lock s <0x0A> </s> ▁Jacob ▁Young ▁( born ▁ 1 9 5 2 ) ▁is ▁an ▁American ▁screen writer , ▁cinemat ograph er , ▁film ▁editor , ▁and ▁film maker ▁best ▁known ▁for ▁creating ▁document ary ▁films ▁that ▁explore ▁ecc ent ric ▁people ▁living ▁in ▁his ▁native ▁App al ach ia . ▁ ▁Career ▁ ▁Young ▁was ▁a ▁producer ▁at ▁W NP B - TV ▁in ▁M org ant own , ▁West ▁Virginia , ▁when ▁he ▁conce ived ▁App al ach ian ▁J unk ument ary ▁( 1 9 8 6 ), ▁a ▁film ▁eventually ▁purchased ▁by ▁over ▁ 9 0 ▁P BS ▁stations ▁and ▁winning ▁a ▁ 1 9 8 8 ▁P BS ▁Special ▁Ach iev ement ▁Award . ▁ ▁It ▁became ▁one ▁of ▁ 1 5 ▁U . S . ▁television ▁shows ▁later ▁selected ▁for ▁an ▁international ▁screen ing ▁conference . ▁ ▁Young ▁was ▁also ▁producer ▁for ▁two ▁seasons ▁of ▁the ▁document ary ▁series ▁D ifferent