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Annalemma - The figure 8 curve that represents the angular offset of the sun from its mean position at as viewed from the earth Balance Point Temperature - The outdoor temperature at which a building makes the transition from a heating to a cooling need Daylight autonomy - The percentage of an area that meets a minimum daylight illuminance level or specified fraction of the operating hours per year. also referred to as special daylight autonomy Daylight factor - The ratio expressed as a percentage othe indoor aluminates at a point on a horizontal surface to the unobstructed Exterior horizontal illuminance Effective aperature - The product of visible transmittance and the window to wall ratio Equation of time - The factor used to account for the difference between solar time and clock time. Solar time is based on the position of the sun. It's basic unit is the solar day Glazing factor - A LEED based number calculated by taking into account window area, floor area, a window geometry factor, light transmission, and a window height factor.Ground light - Visible light from the sun and sky, reflected by exterior surfaces below the plane of the horizon Light shelf - A horizontal element position above eye level and designed to reflect daylight on the ceiling for improved daylighting effectiveness Net metering - The requirement that a utility pay and charge equal rates regardless of which way electricity flows as a part of the utility Grid. Radiation spectrum - The entire range of electromagnetic radiation extending from 0 hz to 1023 hz. This includes visible light as well as infrared radiation, radio waves, and gamma rays among others Radiative cooling - Passive or active design strategy that uses thermal mass to collect and store heat during the day for release at night. Also known as nocturnal cooling and night cooled mass Shading coefficient - The ratio of the solar heat gain thru a glazing product to the solar heat gain through an untreated 1/8 in clear double strength glass under the same set of conditions. This is the value for the glass only, does not include the frame Solar constant - The amount of solar energy that falls in our unit time on her unit area that is 93,000,000 miles from the sun and orientated on a plane perpendicular to the suns rays. The mean value of the solar constant is 433 btu/hr-ftSolar heat gain coefficient - The ratio of the solar heat gain thru a fenestration to the total solar radiation incident on the glazing. Solar time - The time as defined by the sun and it's pos