1. Mick West

    Mick West Administrator Staff Member


    Tabloid media love to invoke the cool sounding "fata morgana" to explain images of things floating in the sky. The problem is that a real fata morgana looks like this:
    There's distortion, and there's inversion.

    It does NOT look like this:
    Source: Science Channel

    Despite the Science Channel's talking heads saying this is a Fata Morgana, it very obviously is not. The giveaway is the total lack of distortion, duplicated images, or inversion. It's just a boat, relatively close to shore, but beyond a false horizon created by the fog bank behind and around the boat, combined with the shallow angle at that distance, altering the reflection off the surface of the sea. If you boost the levels in the image, as I did with the title image of this post, then you can see where the horizon would be.

    The person who shot the video says:
    There's several examples of this type of illusion being "explained" as a fata morgana.

    But again, a little adjustment of the levels shows it's just a change in the surface of the water that's creating a false horizon. You can even see the brighter parts of the boat (where the bridge faces the sun) creating ordinary reflections on the water surface below.


    This photo is higher resolution than the video of the sailboat, and so we can see the difference between the water surface and the sky. We can even see the ripple of the wake from the small boat that's "in" the illusionary sky area.

    Source: thriol on Flickr

    Fata Morgana sounds cool, and it does make some really cool images sometimes. But it's not a panacea explanation for everything that looks like it's floating in the sky.

    See also: Floating Cities are Generally not Fata Morgana Mirages
    Last edited: Oct 1, 2017
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  2. Clouds Givemethewillies

    Clouds Givemethewillies Active Member

    I don't see evidence of fog. I think it is just a patch of water with the same colour as the sky.
  3. Mick West

    Mick West Administrator Staff Member

    Well yes, but it's not like it's different color water. There's a lower quality video out with a wider shot (the apple is a prop for the video shoot)

    You can see a bit of blue sky there. The video also describes fog, so I think it was more apparent to him, assuming he was there.

    I don't think it's a simple as a reflection of a band of fog though, I'm not entirely sure, but I think there's a combination of factors. The surface of the water is reflecting something that looks like the sky behind it, I think the fog serves more to obscure where the true horizon is, and to blend in the sky/sea area with the actual sky.


    In this example there's more haze than fog, but it still serves to obscure the horizon.

    I think the floating sailboat just has a bit more of that.

    The difference in reflection beyond the false horizon is something like this:
    Source: http://www.blackdiamondnow.net/.a/6a00e5513924e6883301bb0948695e970d-pi

    I'm not sure exactly what's going on here, but I have two theories:

    1) for a given size of ripples then at a certain angle the water surface transitions from being dominated by straight reflections (of what is behind it) to being dominated by ambient reflections (of the sky)
    2) Different regions of the water surface have different ripples due to localized variations in wind.
  4. Clouds Givemethewillies

    Clouds Givemethewillies Active Member

    The absence of a reflection of the boat seems odd for such calm conditions. Perhaps there is a thin layer of dense fog, but it must be only an inch or so, as I can see the shape of the transom.
  5. Mick West

    Mick West Administrator Staff Member

    I don't think you'd see a reflection. Look at the lake image above, there's no reflection of the hills. Just scattered reflections of the overall sky color.

    I also don't think it's a 1" layer of fog, there's just fog behind, and perhaps somewhat around the boat.
  6. Clouds Givemethewillies

    Clouds Givemethewillies Active Member

    Watching the video

    Source: https://www.youtube.com/watch?v=QjIxRMWM5do&lc=z22wexjjmkest1ngv04t1aokgluzqsaohsvo2qy50hhhbk0h00410

    there is a good gentle breeze (3 Beaufort) on the dark part of the sea (when in focus) but the boat is hardly moving, although the sails seem to be setting, it is hard to tell with a fully battened main. It needs to be absolutely flat calm to get a specular reflection, so there is no need for fog to obscure a reflection, create that transition line, or at all, although it was reported.. perhaps to explain what they saw.
    Last edited: Oct 1, 2017
  7. Clouds Givemethewillies

    Clouds Givemethewillies Active Member

    T the risk of being controversial, I have noticed that scientists sometimes make the mistake of saying "it must be so and so, and I am a scientist don't you know" because they are too thick to think of anything else!
  8. Bunkmeister

    Bunkmeister New Member

    I actually recognized the ship in the second image of the original post - it is the Kaye E. Barker. I see this ship come into the port of Green Bay on Lake Michigan sometimes. http://www.boatnerd.com/pictures/fleet/kebarker.htm

    Anyhow, this thread is helpful for me to understand misinformation about these visual phenomena.
  9. Lithops

    Lithops New Member

    Just to chime in...

    Boats can be very well be seen floating in air because of it being a mirage, but usually you will see the reflection as well. Just like this one : P1130007.

    Now i know that this is just on a large lake and the opposite shore also has the same distortion which makes the mirage evident, but the key point is that you should see at least some bit of a reflection. Not a sharp bottom of a boat.