Friday, September 12, 2008

A ring around the Moon!!


Last night I looked at the Moon. The Moon was full and there was a huge ring around it. I haven't seen this type of thing before and I don't know what it is. I call it a Moon ring, My bro initially informed me... but I just ignored... but wen my gal frnd showed me tat... I was just stunned...& forwarded text to all my frnds!!
Friends I hope evn this piece of info helpz u...

Answer:
It is an atmospheric effect. The ring around the Moon is caused by the reflection 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 always the same size.

Here is the title and author of a good reference book to physical phenomenon seen in our atmosphere (geared for HS senior or college freshman level)


With regards,
Chet Rockzz

Minnaert, M., The Nature of Light and Color in the Open Air, Dover Publications, New York, 1954.