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The Vertical Ray of the Sun (Vietnamese: Mùa hè chiều thẳng đứng, French: À la verticale de l'été) is the third feature film by Vietnamese-born French director Trần Anh Hùng. It was released in 2000 and is the final part of what many now consider to be Tran's "Vietnam trilogy."
A vertical window facing south (equator side) is effective for capturing solar thermal energy. For comparison, the winter sun in the Southern Hemisphere (May, June, July) rises in the northeast, peaks out at a low angle in the north (more than halfway up from the horizon in the tropics), and then sets in the northwest.
At these times, the Sun appears in the direction of Mecca, and shadows cast by vertical objects determine the qibla. At two other moments in the year, the Sun passes through the nadir (the antipodal zenith) of the Kaaba, casting shadows that point in the opposite direction, and thus also determine the qibla. These occur on 12, 13, or 14 January ...
At this point, the Sun's rays will fall exactly vertical relative to an object on the ground and thus cast no observable shadow. [ 2 ] To an observer on a planet with an orientation and rotation similar to those of Earth , the subsolar point will appear to move westward with a speed of 1600 km/h, completing one circuit around the globe each day ...
The solar zenith angle is the zenith angle of the sun, i.e., the angle between the sun’s rays and the vertical direction.It is the complement to the solar altitude or solar elevation, which is the altitude angle or elevation angle between the sun’s rays and a horizontal plane.
The solar azimuth angle is the azimuth (horizontal angle with respect to north) of the Sun's position. [1] [2] [3] This horizontal coordinate defines the Sun's relative direction along the local horizon, whereas the solar zenith angle (or its complementary angle solar elevation) defines the Sun's apparent altitude.
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The position of the Sun in the sky is a function of both the time and the geographic location of observation on Earth's surface. As Earth orbits the Sun over the course of a year, the Sun appears to move with respect to the fixed stars on the celestial sphere, along a circular path called the ecliptic.