Visual range The longest distance that a large, black object can be seen against the sky at the horizon with the unaided eye.
Helicopters and, out of visual range, F-16 and F-15 fighter jets were overhead.
The longer the voyage, the greater the chance it will pass within visual range of particular ground sites.
"That was in visual range of an American base," he said.
There they were, the presidential dishes, but well beyond visual range.
Finally, the correlation between each index and the visual range estimated by trained investigators are evaluated.
The visual range measured with CRDS agrees well with visibility observations from Shanghai Meteorological Bureau.
Every year, as satellites and electronic sensors further extend the visual range, more and more of the astronomical drama takes place on invisible stages.
"This is an optical material that is totally transparent in the visual range, and which you can process like a polymer," he says.
MacIver, M. A., Schmitz, L., Mugan, U., Murphey, T. D. & Mobley, C. D. Massive increase in visual range preceded the origin of terrestrial vertebrates.
Masri S, Garshick E, Hart J, Bouhamra W, Koutrakis P. Use of visual range measurements to predict fine particulate matter exposures in Southwest Asia and Afghanistan.
