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 ?
By design, the condensed model exactly matches the predictions of the full REST2 model at a zenith angle of 0[degrees].
Inputs Used with REST2 to Derive the Reference Data Sets for the 2009 and 2013 Handbook--Fundamentals Input 2009 Handbook-- 2013 Handbook-- Fundamentals range Fundamentals range Month 1 to 12 Not set Time 0 to 12 Not set Latitude, [degrees] 0, 15, 30, 45, 60,75 Not set Zenith angle, [degrees] Set from above 0 to 85[degrees] in 0.
That is, for each month, the full REST2 model was run with inputs interpolated from the sets above, over the whole range of zenith angles from local solar noon to 85[degrees]; [[tau].