Tip o’ the Pileus

Since I say the phrase so much in these ‘pages’, it seems appropriate to point out a photo of an “iridescent pileus cloud’ which was the Astronomy Picture of the Day a couple days ago:

Of course, it clearly gets its name from the fact that is a sort of ‘cap’ on another cloud, but if you need a bit more detail, the Wikipedia article: Pileus (meteorology) is as good a source as any. If you’re wondering what an ancient Roman pileus looked like:

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