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 A Circle Around the Moon.

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Posts : 46
Join date : 2010-01-18
Age : 28
Location : Somewhere Under the Neon Lights, Las Vegas, Nevada

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PostSubject: A Circle Around the Moon.   A Circle Around the Moon. Icon_minitimeFri Jan 29, 2010 11:28 pm

Well its a full moon this evening, and I was wondering if any one else has noticed the beautiful halo around the moon? And now I am not talking about the moon's natural aura.

Your probably wondering what its caused from if you havent already google searched it like myself.

I found this cool website that gives information about the different types of halos that can surround the moon.

The moon can produce interesting optical effects when conditions are right. The most common of which are moon rings, moon bows, which are similar to rainbows, moon dogs and moon pillars. A rainbow is produced when sunlight is refracted through water droplets - A similar effect is produced when moon light refracts through ice crystals. Below are a few photographs and examples about this interesting phenomena. Thanks to everyone that helped me put together this simple explanation of moon light effects.
A Ring Around The MoonThe ring around the Moon is caused by the refraction of Moonlight (which of course is reflected sunlight) from ice crystals in the upper atmosphere. The shape of the ice crystals results in a focusing of the light into a ring. Since the ice crystals typically have the same shape, namely a hexagonal shape, the Moon ring is almost always the same size.
A Circle Around the Moon. Moonring4

Less typical are the halos that may be produced by different angles in the crystals. They can create halos with an angle of 46 degrees.

Moon Ring Weather Folklore Folklore has it that a ring around the moon signifies bad weather is coming, and in many cases this may be true. So how can rings around the moon be a predictor of weather to come? The ice crystals that cover the halo signify high altitude, thin cirrus clouds that normally precede a warm front by one or two days. Typically, a warm front will be associated with a low pressure system which is commonly referred to as a storm.
It is believed that the number of stars within a moon halo indicate the number days before bad weather will arrive. Give it a try the next time you observe a moon halo.

Rings Around The Sun- The same phenomena that causes lunar halos can also be observed around the sun. A few photos of solar halos using a Coolpix 995 digital camera. NOTICE: Never look at or photograph the sun directly.

Anatomy of a Moon HaloThe ring that appears around the moon arises from light passing through six-sided ice crystals high in the atmosphere. These ice crystals refract, or bend, light in the same manner that a camera lens bends light. The ring has a diameter of 22° , and sometimes, if you are lucky, it is also possible to detect a second ring, 44° diameter. Thin high cirrus clouds lofting at 20,000 feet or more contain tiny ice crystals that originate from the freezing of super cooled water droplets. These crystals behave like jewels refracting and reflecting in different directions.
A Circle Around the Moon. Moonhaloexp

Cloud crystals are varieties of hexagonal prisms, (6 sides) and range in shapes from long columns to thin plate-like shapes that have different face sizes.

If you click the link above the information I posted, it gives you a little bit more in depth look into the other different light phenomenas that surround the moon.
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Join date : 2010-01-27

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PostSubject: Re: A Circle Around the Moon.   A Circle Around the Moon. Icon_minitimeSun Jan 31, 2010 10:32 pm

The moon is a very informative piece of work. Nice study.
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