Optical phenomenon
observable events that result from the interaction of light and matter
gegenschein
color
fine weather
lustre
moon dog
colorless
opalescence
parallax
reflection
transient lunar phenomenon
luminescence
zodiacal light
optical aberration
spectral line
depth of field
diffraction spike
Tyndall effect
diffuse sky radiation
diamond ring effect
atmospheric optical phenomenon
impossible color
Abney effect
Hidden faces
aurora polaris
slow light
horizon
blue field entoptic phenomenon
dichromatism
extinction cross
asterism
Brocken spectre
Baily's beads
fog bow
Airy disk
iridescence