▁is ▁possible ▁to ▁use ▁the ▁polar ization ▁patterns ▁as ▁a ▁tool ▁for ▁navigation ▁at ▁night . ▁The ▁only ▁difference ▁is ▁that ▁the ▁degree ▁of ▁polar ization ▁is ▁not ▁quite ▁as ▁strong . ▁ ▁Under lying ▁surface ▁properties ▁can ▁affect ▁the ▁degree ▁of ▁polar ization ▁of ▁the ▁day time ▁sky . ▁The ▁degree ▁of ▁polar ization ▁has ▁a ▁strong ▁dependence ▁on ▁surface ▁properties . ▁ ▁As ▁the ▁surface ▁reflect ance ▁or ▁optical ▁thick ness ▁increase , ▁the ▁degree ▁of ▁polar ization ▁decre ases . ▁ ▁The ▁Ray le igh ▁sky ▁near ▁the ▁ocean ▁can ▁therefore ▁be ▁highly ▁dep olar ized . ▁ ▁Last ly , ▁there ▁is ▁a ▁clear ▁w avel ength ▁dependence ▁in ▁Ray le igh ▁scatter ing . ▁It ▁is ▁greatest ▁at ▁short ▁w avel ength s , ▁whereas ▁sk yl ight ▁polar ization ▁is ▁greatest ▁at ▁middle ▁to ▁long ▁w avel ength s . ▁Initial ly ▁it ▁is ▁greatest ▁in ▁the ▁ult rav io let , ▁but ▁as ▁light ▁moves ▁to ▁the ▁Earth ' s ▁surface ▁and ▁interact s ▁via ▁multiple - path ▁scatter ing ▁it ▁becomes ▁high ▁at ▁middle ▁to ▁long ▁w avel ength s . ▁The ▁angle ▁of ▁polar ization ▁shows ▁no ▁variation ▁with ▁w avel ength . ▁ ▁Us es ▁ ▁Navigation ▁Many ▁animals , ▁typically ▁insect s , ▁are ▁sensitive ▁to ▁the ▁polar ization ▁of ▁light ▁and ▁can ▁therefore ▁use ▁the ▁polar ization ▁patterns ▁of ▁the ▁day time ▁sky ▁as ▁a ▁tool ▁for ▁navigation . ▁ ▁This ▁theory ▁was ▁first ▁proposed ▁by ▁Karl ▁von ▁Fr isch ▁when