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Site Index (somewhat out of date - try the above Google Site Search first):
A B C D E F G Halos H I J K L M N O P R S T V W

A	Aircraft - Sky phenomena from Anti-crepuscular rays Antisolar halos Flattened sun and moon Glory Lower tangent arc Opposition effect Subhorizon halos Subparhelia Subsun Lower sun pillars and subsun Ammonia crystal halos	Angles in the sky - estimating them Anthelion ~ South Pole display Anti-crepuscular rays Antisolar point Centre of glory Centre of heiligenschein Centre of opposition effect Convergence point of sunrays Arcs below horizon Arctic fogbows Artificial light pillars Atmospheric refraction
B	Bishop's ring Bending of light rays Atmospheric refraction Mirages of sunsets	Books - sky phenomena Brocken Spectre
C	Carbon dioxide crystal halos Circumscribed halos Circumzenithal arc Cirrus cloud Cloud bow = fogbow Clouds Colours - iridescence Shadows Sizes of droplets in Water content of Coloured rings around Antisolar point opposite sun Sun and moon Corona 22º halo	Coloured rings around ~ continued Shadows Brocken Spectre Glory Heiligenschein Opposition Effect Colours at sunset Contact arcs to 22º halo Contrail shadows Corona Crepuscular rays Crystals ~ Ice Alignment in clouds Diamond dust Plates & columns Sizes needed to make halos
D	Dew - Heigenschein Diamond dust Crystals Diffraction By water droplets Corona formation Glory formation	Distorted sunsets Dogs - sundogs Double sunsets Dust - scattering by
E	Earth's Shadow Etruscan vase sunset	Eye safety Looking at halos Looking at coronas
F	False suns = sundogs Fata Morgana Fisheye lens Door viewer substitute Mirror substitute Fog - sizes of droplets in	Fogbows From car headlights Supernumerary arcs Rainbows ~ relation to Flattened sun Flattened moon
G	Green flash Glory Formation From the air ~ video On mountains	Glows around shadows Glory Heiligenschein Opposition effect
H	Halos 120º parhelia 22º halo Around the Moon Colours Formation & ray paths How the circle is formed Random orientations? 46º halo Was it a supralateral arc? 9º halo Aligned crystals Ammonia crystal halos Anthelic arcs Anthelion ~ rare Anthelion ~ South Pole display Antisolar arc Antisolar region arcs Carbon dioxide crystal halos Circumhorizon arc Circumscribed halo Circumzenithal arc Common halos Complex halo displays Crystals Alignment in clouds Cubic symmetry Diamond dust Plates & columns Pyramidal - Halos from Real crystals and defects Sizes needed to make halos Diffuse arcs South Pole ~ from the air Eye care! Frequency of occurence Visible more often than rainbows Frequent halos HaloSim software Hastings arc ~ rare Heliac arc ~ rare Ice crystals Infralateral arc Kern arc Light pillars Lowitz arcs Lunar halos 22º circular Circumscribed Halo Moon dogs Paraselenae Paraselenic Circle Heiligenschein Hexagonal ice crystals Hole in the sky	Halos (continued) Multiple displays Observing halos Eye care! Odd radius halos Other world halos Parhelia Parhelic circle Lunar Many ray paths Parry arcs Discovery by Parry Effect of solar altitude Parry antisolar arc Parry infralateral arcs ~ rare At South Pole Parry supralateral arcs ~ rare At South Pole Sunvex & Suncave Photography Pillars Plate crystals Prisms Pyramidal crystals Pyramidal crystal arcs Rare halos Why are some halos rare? St Petersburg display Safety! Simulation of Subanthelic arcs Subhelic arc ~ rare Drawn by Parry in 1820 Subhorizon arcs Subparhelic circle Subsun Subsun dogs Sundogs Changes in appearance Elongated Sometimes blindingly bright Sun pillars Supralateral arc Tape arcs Tangent arcs Tricker arc ~ rare Real ice crystals - photographs Upside down rainbow Wegener arc ~ rare
I	Ice crystals Sizes to produce halos Interference Inversion - causing distorted sunsets	Iridescence Iridescent clouds IRIS software Irisation
J	Jupiter - halos on?
K	Kern arc
L	Lenticular clouds Light pillars Light scattering By water droplets Rayleigh Mie	Links to other sites Lowitz arcs Lunar fogbow Lunar halos 22º circular Moon dogs
M	Mars Abnormal brightness Halos on? Opposition effect Mie scattering Sunsets Water droplets Watery sunsets Minimum deviation phenomena 22º halo animation Fogbow Rainbow Sundogs Mirages OPOD mirage pages Terrestrial, Inferior, Superior, Fata Morgana... Sunset and sunrise mirages	Mist Sizes of droplets in Mist bow = fogbow Mock suns Moon 22º halo Colour during total eclipse Crepuscular rays Dogs = Paraselenae Fogbow Moonrise from Earth orbit Moonset from ISS Why is the full moon so bright? Mother of pearl clouds Mountain shadows
N	Nacreous clouds
O	Opposition effect Opposition effect on Mars Opposition effect streak	Orientation of ice crystals
P	Paranthelia = 120º parhelia Paraselene Parhelia 22º 120º Parhelic circle Parry arcs Parry arcs - discovery of Perspective effects - crepuscular rays	Photographing halos Pileus cloud iridescence Pillars Pilot's Bow = glory or complete rainbow Plate crystals Polar Stratospheric Clouds Prisms PSCs Pyramidal ice crystals
R	Rainbows AirySim Airy theory Alexander's dark band Bowsim Cloud bows Colour purity Cone of rays Dew Bows Glass bead bows Higher order bows Key to section Moon bows Not rainbows! Raindrop shapes Raindrop sizes Raypaths for rainbows Primary Secondary higher orders Red bows Reflection bows Seawater bows Secondary bow Spider web bow Spokes Supernumerary bows Colours Drop size On secondary bow	Traffic sign bows Twinned bows Wave theory - need for Wheel Zero order glow Rainbow-like arcs 22º halo Circumzenithal arc Corona Glory Upside down rainbow Rayleigh scattering - sunset colours Rays Crepuscular Anticrepuscular Rays of Buddha Real ice crystals - photographs Refraction Atmospheric Water drop - fogbow, heiligenschein Rings around sun or moon 22º halo Circumscribed halo Corona Odd radius halos Ropes of Maui = crepuscular rays
S	Safety Looking at halos Looking at coronas Photography Saturn - halos on? Scattering Air Clouds Light Mie Rayleigh Water droplets Shadows Brocken spectre Clouds Mist Rocket plumes Contrails Shadow hiding	Shadows ~continued Glows around Glory Heiligenschein Opposition effect Sky colours Spectre of the Brocken Subanthelic point = antisolar point Halos around Subparhelic circle Sun pillars Sun beams = crepuscular rays Sun drawing water = crepuscular rays Sundogs Changes in appearance Not always 22° from the sun Sometimes blindingly bright Sunsets Supernumerary arcs - fogbow Surface waves
T	Tangent arcs	Temperature inversion - at sunset
V	Venus pillar	Volcanic eruptions - sunsets
W	Water droplets in clouds and fog	Watery sunsets White rainbow = fogbow

A B C D E F G Halos H I J K L M N O P R S T V W

'The time has come,' the Walrus said,    'To talk of many things:
      Of shoes—and ships—and sealing wax— Of cabbages—and kings—
            And why the sea is boiling hot— And whether pigs have wings.’     Alice