![]() ![]() Calculate noon solar zenith angle and the solar altitude at noon for Vancouver, WA (45.6 N) on: Dec. What is the noon zenith angle in Orlando Florida (latitude 28.5 o ) on Sept 21? What is the noon zenith angle in Anchorage (60 N) on June 21? (show your calculations)Ĥ Part 1. At sunrise or sunset the solar zenith angle is and the solar Altitude is. When the sun is directly over your head the solar zenith angle is and the solar Altitude is. 21 the sun is 6.5 degrees above the horizon at noon. 60- (-23.5) = The altitude of the sun above the horizon is 90 - zenith angle. I.e = 66.5 The noon zenith angle at in Anchorage (60 N) on Dec 21 is 83.5 since the sun is directly overhead (23.5 S) on Dec 21. ![]() ***The noon zenith angle at the North pole (90 N) on June 21 is 66.5 since the sun is directly overhead 23.5 N on June 21. For example: The noon zenith angle at the tropic of cancer on June 21 is zero since the sun is directly overhead 23.5 N on June 21. subtract the declination from your latitude. determine the latitude for which the sun is directly overhead at noon (the declination). In the figure at left Z is the zenith angle and A is the altitude (A=90-z) the angle from the horizon to the sun.Ģ Below are 3 figures showing the position of the sun for Winter Solstice, Summer Solstice, and the Equinoxes.ģ In Summary, to calculate the solar Zenith Angle at noon for your latitude: 1. The main point is that all rays that leave the sun and hit the Earth travel essentially parallel to each other as they reach Earth. In the drawing (below right) The Earth is drawn much larger than it should be if the vertical scale matched the horizontal scale. 1 Shadows and Solar Zenith Name Lab Partner Section Introduction: The solar zenith angle is defined to be the angle between the sun and a line that goes straight up (to the zenith) In reality the sun is very far from Earth and relative to this distance the Earth is very small. ![]()
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