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  2. Solar irradiance - Wikipedia

    en.wikipedia.org/wiki/Solar_irradiance

    In fact, under clear skies a solar panel placed horizontally at the north or south pole at midsummer receives more sunlight over 24 hours (cosine of angle of incidence equal to sin(23.5°) or about 0.40) than a horizontal panel at the equator at the equinox (average cosine equal to 1/ π or about 0.32).

  3. Solar zenith angle - Wikipedia

    en.wikipedia.org/wiki/Solar_zenith_angle

    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. [1] [2] At solar noon, the zenith angle is at a minimum and is equal to latitude minus solar declination angle. This is the basis by which ancient mariners navigated the oceans. [3]

  4. Acceptance angle (solar concentrator) - Wikipedia

    en.wikipedia.org/wiki/Acceptance_angle_(solar...

    All rays now miss the receiver and all light is lost. Therefore, for incidence angles α < θ all light is captured while for incidence angles α > θ all light is lost. The concentrator is then said to have a (half) acceptance angle θ, or a total acceptance angle 2θ (since it accepts light within an angle ±θ to the optical axis).

  5. Solar azimuth angle - Wikipedia

    en.wikipedia.org/wiki/Solar_azimuth_angle

    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.

  6. Position of the Sun - Wikipedia

    en.wikipedia.org/wiki/Position_of_the_Sun

    This is the coordinate system normally used to calculate the position of the Sun in terms of solar zenith angle and solar azimuth angle, and the two parameters can be used to depict the Sun path. [3] This calculation is useful in astronomy, navigation, surveying, meteorology, climatology, solar energy, and sundial design.

  7. Passive solar building design - Wikipedia

    en.wikipedia.org/wiki/Passive_solar_building_design

    All of these factors can be modeled more precisely with a photographic light meter and a heliodon or optical bench, which can quantify the ratio of reflectivity to transmissivity, based on angle of incidence. Alternatively, passive solar computer software can determine the impact of sun path, and cooling-and-heating degree days on energy ...

  8. Solar gain - Wikipedia

    en.wikipedia.org/wiki/Solar_gain

    The shading coefficient (SC) is a measure of the radiative thermal performance of a glass unit (panel or window) in a building.It is defined as the ratio of solar radiation at a given wavelength and angle of incidence passing through a glass unit to the radiation that would pass through a reference window of frameless 3 millimetres (0.12 in) Clear Float Glass. [3]

  9. Albedo - Wikipedia

    en.wikipedia.org/wiki/Albedo

    While directional-hemispherical reflectance factor is calculated for a single angle of incidence (i.e., for a given position of the Sun), albedo is the directional integration of reflectance over all solar angles in a given period. The temporal resolution may range from seconds (as obtained from flux measurements) to daily, monthly, or annual ...

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