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after-image altitude appear atmosphere axis background becomes bicycle wheel blue sky bluish bright brighter caused circumscribed halo cirrus clouds clouds colour contrast corona cosmic dust crepuscular rays curvature curved dark darker deviation diameter diffraction direction distance drops of water dust earth edge explained formed front gaze glass glow green ray grey Haidinger's brush height Heiligenschein horizon illuminated incident intensity lamp landscape layer less look measure minutes of arc mirage mist mock suns moon move night notice objects obliquely observed optical orange pane particles patch of light phenomenon plane Plate polarisation purple light rainbow rays of light refraction retina ring ripples round scattering scintillation seems seen shadow shape shining side slightly small halo source of light spot stars striking sunset surface Theory of Colours tint trees vertical violet visible waves window yards yellow zenith zodiacal light