Abstract

A long-standing assumption about the clear sky is that its colors and luminances are distributed symmetrically about the principal plane. As useful as this approximation is, our digital-image analyses show that clear-sky color and luminance routinely depart perceptibly from exact symmetry. These analyses reconfirm our earlier measurements with narrow field-of-view spectroradiometers [J. Opt. Soc. Am. A 18, 1325 (2001)], and they do so with much higher temporal and angular resolution across the entire sky dome.

© 2003 Optical Society of America

Colorimetric and spectroradiometric characteristics of narrow-field-of-view clear skylight in Granada, Spain

Javier Hernández-Andrés, Javier Romero, and Raymond L. Lee
J. Opt. Soc. Am. A 18(2) 412-420 (2001)

Twilight and daytime colors of the clear sky

Raymond L. Lee
Appl. Opt. 33(21) 4629-4638 (1994)

Tropospheric haze and colors of the clear daytime sky

Raymond L. Lee
Appl. Opt. 54(4) B232-B240 (2015)

Tropospheric haze and colors of the clear twilight sky

Raymond L. Lee and Duncan C. Mollner
Appl. Opt. 56(19) G179-G187 (2017)

Digital imaging of clear-sky polarization

Raymond L. Lee
Appl. Opt. 37(9) 1465-1476 (1998)