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Haloes Forecast Storms
Part I of Essay
NEWSCIENCE
If you know where and when to look, you can treat yourself to a colourful
display of atmospheric haloes, spots and pillars. These images can tell
you something about the clouds overhead and possible changes in the
weather.
All of these images are created by li .... Part II of Essay
.... direction, or refracts. The radius of the hale depends on
the amount of change in the direction of the sun's light. Usually this is
22 degrees. Since the sun is 1/2 of a degree across, the radius of the
halo is 44 sun-widths. Occasionally you may see a second halo at 46
degrees from the sun (that is, with a radius of 92 sun-widths). This is
produced by sunlight passing through both the side and bottom of each
crystal. Moonlight will also produce a halo, around the moon, with the
proper layer of cirrostatus.
Another common optical ....
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Words: 520 - Pages: 2
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