Halos are born when light is refracted or reflected in icecrystals of different shapes. There is no way to make a halo guide here because of the richness of possible forms. Just be observant wherever you are and check your day and night sky whenever there are cirrus-type clouds passing by. Images ha03222 and ha03122 show a 9 degrees' ring (next page) while image ha00954 shows several (anomalous) sun centered rings; ha01323 an ellipsoid halo.
Images hk** show halos around moon and finally hl**** are halos from airplane. Airplane would be a wonderful place to hunt several atmospherical phenomena, so any vacant and cheap seats somewhere...?
ha00211
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ha00444
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ha00451
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ha00531
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ha00623
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ha00644
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ha00731
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ha00734
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ha00942
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ha00954
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ha01042
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ha01113
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ha01232
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ha01323
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ha01354
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ha01822
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ha01911
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ha01912
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ha01914
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ha01931
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ha02143
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ha02211
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ha02221
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ha02223
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ha02244
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ha02311
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ha02332
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ha02354
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ha02431
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ha02453
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hk00153
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hk00222
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hk00311
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hk00352
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hl00142
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hl00234
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