zenith angle


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zenith angle

[′zē·nəth ‚aŋ·gəl]
(astronomy)
The angle between the direction to the zenith and the direction of a light ray.
References in periodicals archive ?
In this latest work, one neutral scale height that depends on solar zenith angle and on altitude above the main peak is obtained for each phase of the solar cycle (same phases than in this work).
The view zenith angle was arranged from -60deg to 60deg with an interval of 10deg, where positive angle corresponds to back-to-the-sun, and negative angle corresponds to facing-the-sun.
Figure 7 shows the degree of depolarization DP(x, z) of QHG beams versus zenith angle [theta].
By design, the condensed model exactly matches the predictions of the full REST2 model at a zenith angle of 0[degrees].
In both second-and old-growth stands, unweighted canopy openness, as determined by analysis of the percentage of open points in five zenith angle bands of the hemispheric photographs, was highest at the zenith and decreased with increasing zenith angle.
The standard PATMOS-x product employs a "nadir overlap" method that involves the preferential selection of pixels with a lower-viewing zenith angle (most nadir).
To calculate the mean directionality of either direct or diffuse radiation, the center of each sector of the sky was represented as a vector, with an azimuth ([Alpha]) and zenith angle (0).
The total station serves for measurement of zenith angles of stars, while the computer serves as recording equipment for epoch and total station's data.
Their studies included reflectance compensation of the effect of varying solar zenith angles so that the validation remains under time constraint.