▁located ▁at ▁the ▁z en ith ▁the ▁polar ization ▁is ▁independent ▁of ▁az im uth ▁and ▁decre ases ▁with ▁rising ▁alt itude ▁( as ▁it ▁approaches ▁the ▁sun ). ▁ ▁The ▁pattern ▁then ▁continues ▁as ▁the ▁sun ▁approaches ▁the ▁horizon ▁once ▁again ▁for ▁sun set . ▁The ▁video ▁ends ▁with ▁the ▁sun ▁below ▁the ▁horizon . ▁ ▁Pol ar ization ▁angle ▁ ▁The ▁scatter ing ▁plane ▁is ▁the ▁plane ▁through ▁the ▁sun , ▁the ▁observer , ▁and ▁the ▁point ▁observed ▁( or ▁the ▁scatter ing ▁point ). ▁ ▁The ▁scatter ing ▁angle , ▁ γ , ▁is ▁the ▁angular ▁distance ▁between ▁the ▁sun ▁and ▁the ▁observed ▁point . ▁The ▁equation ▁for ▁the ▁scatter ing ▁angle ▁is ▁derived ▁from ▁the ▁law ▁of ▁cos ines ▁to ▁the ▁spher ical ▁triangle ▁( refer ▁to ▁the ▁figure ▁above ▁in ▁the ▁geometry ▁section ). ▁It ▁is ▁given ▁by : ▁ ▁In ▁the ▁above ▁equation , ▁ ψ s ▁and ▁▁ θ s ▁are ▁respectively ▁the ▁az im uth ▁and ▁z en ith ▁angle ▁of ▁the ▁sun , ▁and ▁ ψ ▁and ▁ θ ▁are ▁respectively ▁the ▁az im uth ▁and ▁z en ith ▁angle ▁of ▁the ▁observed ▁point . ▁ ▁This ▁equation ▁breaks ▁down ▁at ▁the ▁z en ith ▁where ▁the ▁angular ▁distance ▁between ▁the ▁observed ▁pointing ▁and ▁the ▁z en ith , ▁ θ s ▁is ▁ 0 . ▁Here ▁the ▁orientation ▁of ▁polar ization ▁is ▁defined ▁as ▁the ▁difference ▁in ▁az im uth ▁between ▁the ▁observed ▁pointing ▁and ▁the ▁solar ▁az im uth . ▁ ▁The