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Solar elevation : ウィキペディア英語版
Solar zenith angle
The solar zenith angle is the angle between the zenith and the centre of the sun's disc. The solar elevation angle is the altitude of the sun, the angle between the horizon and the centre of the sun's disc. Since these two angles are complementary, the cosine of either one of them equals the sine of the other. They can both be calculated with the same formula, using results from spherical trigonometry.
==Formula==
: \cos \theta_s = \sin \alpha_s = \sin \phi \sin \delta + \cos \phi \cos \delta \cos h
where
* ''θ''''s'' is the ''solar zenith angle''
* ''α''''s'' is the ''solar elevation angle'', ''α''''s'' = 90° – ''θ''''s''
* ''h'' is the hour angle, in the local solar time.
* ''δ'' is the current declination of the Sun
* ''φ'' is the local latitude.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
ウィキペディアで「Solar zenith angle」の詳細全文を読む



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