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awesome

  • 01-02-2015 9:02pm
    #1
    Maudi
    Registered Users, Registered Users 2 Posts: 1,516 ✭✭✭


    Wow..just looking up tonight at our moon..can somebody explain the huge ring surrounding it tonight? Looks awesome.(over wicklow)


Comments

  • #2
    keith16
    Closed Accounts Posts: 8,061 ✭✭✭keith16


    I agree, awesome!


  • #3
    Captain Chaos
    Registered Users, Registered Users 2 Posts: 11,174 ✭✭✭✭Captain Chaos


    It's to do with a lensing effect due to ice crystals high in the air during cold weather.


  • #4
    Ogie84
    Registered Users, Registered Users 2 Posts: 83 ✭✭Ogie84


    Its incredibly impressive over Cork at the moment. The Halo, for want of a better word, is huge


  • #5
    AdamB
    Registered Users, Registered Users 2 Posts: 168 ✭✭AdamB


    From Co. Tipperary tonight


  • #6
    jfSDAS
    Registered Users, Registered Users 2 Posts: 352 ✭✭jfSDAS


    A friend in Limerick texted me last night about the lunar halo too. As keith16 and Captain Chaos say, it's an effect due to moonlight (or sunlight) passing through and being refracted in ice crystals. Les Cowley's web site http://www.atoptics.co.uk is a great introduction to the world of atmospheric optics.

    An excellent book is Tim Herd's "Kaleidoscope Sky" which is available for a few euro on sites like Amazon or via http://www.bookfinder.com

    I've quite a few books on meteorological optics on the shelf at home such as Minnaert's classic "Light and Color in the Outdoors" and "Color and Light in Nature" by David Lynch/William Livingston. Another worthwhile addition is "Out of the Blue: The 24 hour skywatcher's guide" by John Naylor. If I was to say which book of the three to source first I'd go for Naylor's because it contains a lot of material on observing the sky with the unaided eye.

    Keep looking up!

    John


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