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WikiPedia: Hào quang 22° http://www.thedenverchannel.com/news/30355738/deta... http://earthsky.org/space/what-makes-a-halo-around... http://www.atoptics.co.uk/fza103.htm http://www.atoptics.co.uk/halo/circ1.htm http://www.atoptics.co.uk/halo/circ2.htm http://www.atoptics.co.uk/halo/circular.htm https://commons.wikimedia.org/wiki/22%C2%B0-halo?u...