This is a photo of a classic cirrostratus sky. Taken at Cedar Falls, Iowa on 11-26-2017 at 3:15 p.m. CST,  it shows diffused sunlight and the classic "milky" sky of cirrostratus. The photo also reveals several CONTRAILS (condensation trails) left by passing aircraft. The hint of a halo is visible in an arc right of the Sun. Halos are caused by sunlight being refracted as it passes through ice crystals contained in the cirrostratus. The halo was only visible in the photo - not with the naked eye.