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| Observing - Getting started |  |
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| Halos
are visible much more often than rainbows, usually at least once or
twice a week. To find them successfully, shield the eyes from excessive
glare and know their sizes in the sky. |
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Shield the sun Halos are much more easily seen when the sun is shielded. Use a building, a tree, a post or a hand. Always shield both eyes and never look directly at the sun. Colourful
22� halo and fragment of upper tangent |
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| Halo
sizes The most common is the 22� radius circular halo. It is easily found in the sky. Stretch out your arm and spread your fingers wide. The distance from the thumb to the tip of the little finger is then about 20�. Cover the sun with the thumb and the 22� halo will be near the tip of the small finger. 22�
circular halo and circumscribed halo. 21st May 01 |
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