▁This ▁can ▁be ▁seen ▁at ▁the ▁non ▁symmetric ▁circles ▁about ▁the ▁line ▁of ▁symmetry . ▁It ▁then ▁follows ▁the ▁same ▁pattern ▁across ▁the ▁sky ▁as ▁the ▁q ▁input . ▁ ▁Ne ut ral ▁points ▁and ▁lines ▁Are as ▁where ▁the ▁degree ▁of ▁polar ization ▁is ▁zero ▁( the ▁sk yl ight ▁is ▁un pol ar ized ), ▁are ▁known ▁as ▁neutral ▁points . ▁Here ▁the ▁Sto kes ▁parameters ▁Q ▁and ▁U ▁also ▁equal ▁zero ▁by ▁definition . ▁The ▁degree ▁of ▁polar ization ▁therefore ▁increases ▁with ▁increasing ▁distance ▁from ▁the ▁neutral ▁points . ▁ ▁These ▁conditions ▁are ▁met ▁at ▁a ▁few ▁defined ▁locations ▁on ▁the ▁sky . ▁ ▁The ▁Arag o ▁point ▁is ▁located ▁above ▁the ▁ant is olar ▁point , ▁while ▁the ▁Bab inet ▁and ▁B rew ster ▁points ▁are ▁located ▁above ▁and ▁below ▁the ▁sun ▁respectively . ▁The ▁z en ith ▁distance ▁of ▁the ▁Bab inet ▁or ▁Arag o ▁point ▁increases ▁with ▁increasing ▁solar ▁z en ith ▁distance . ▁These ▁neutral ▁points ▁can ▁depart ▁from ▁their ▁regular ▁positions ▁due ▁to ▁inter ference ▁from ▁dust ▁and ▁other ▁a eros ols . ▁ ▁The ▁sk yl ight ▁polar ization ▁switch es ▁from ▁negative ▁to ▁positive ▁while ▁passing ▁a ▁neutral ▁point ▁parallel ▁to ▁the ▁solar ▁or ▁ant is olar ▁mer id ian . ▁The ▁lines ▁that ▁separate ▁the ▁regions ▁of ▁positive ▁Q ▁and ▁negative ▁Q ▁are ▁called ▁neutral ▁lines . ▁ ▁De pol ar ization ▁The ▁Ray le igh ▁sky ▁causes ▁a ▁clearly ▁defined ▁polar ization ▁pattern ▁under ▁many ▁different ▁circumstances . ▁ ▁The ▁degree