### Available light

**1.1 Solar geometry**- 1.11 Solar declination
- 1.12 Equation of time
- 1.13 True solar time and hour angle
- 1.14 Solar altitude and azimuth
- 1.15 Astronomical daylength
- 1.16 Shadow length
- 1.17 Ground shadow area of a rectangular building
**1.2 Sunlight**- 1.21 Illuminance turbidity factor
- 1.22 Relative optical air mass
- 1.23 Extraterrestrial solar illuminance
- 1.24 Illuminance from direct sunlight
**1.3 Skylight**- 1.31 Daylight availability: global & diffuse
- 1.32 Clear sky luminance and illuminance
- 1.33 Overcast sky luminance and illuminance
- 1.34 BRE average sky luminance and illuminance
- 1.35 Daylight coefficients and subdivision of the sky
**1.4 External surfaces**- 1.41 Light reflected from the ground
- 1.42 Luminance of external obstructions
- 1.43 Specular reflection in external surfaces
- 1.44 Obstruction of the sky by trees
### Daylight factor methods

**2.1 Total**- 2.11 Daylight factor definition
- 2.12 Average daylight factor
- 2.13 Corrections to calculated daylight factor
**2.2 Externally reflected component**- 2.21 Externally reflected component of the daylight factor
**2.3 Sky component**- 2.31 Sky factor for unglazed vertical rectangular opening
- 2.32 Sky component for unglazed vertical rectangular opening
- 2.33 Sky component for unglazed horizontal rectangular opening
- 2.34 Directional transmittance of clear glass
- 2.35 Directional transmittance of non-clear glass
- 2.36 Diffuse transmittance of non-clear glass
- 2.37 Diffuse reflectance of non-clear glass
**2.4 Internally reflected component**- 2.41 Average internally reflected component for vertical windows
- 2.42 Minimum internally reflected component for vertical windows
- 2.43 Average internally reflected component for rooflights
### Finite area methods

**3.1 Form factors**- 3.11 Configuration factor and form factor definitions
- 3.12 Form factor for identical parallel, opposite rectangles
- 3.13 Form factor for two perpendicular rectangles
- 3.14 Configuration factor for element parallel to rectangle
- 3.15 Configuration factor for element perpendicular to rectangle
- 3.16 Configuration factor and form factor with triangular subdivision
**3.2 Radiosity method**- 3.21 General radiosity method using triangular patches (Currently Missing)
- 3.22 Test for hidden points with triangular subdivision
- 3.23 Daylight coefficient: direct component
- 3.24 Solution of inter-reflection equations
### Ray tracing methods

**4.1 Monte Carlo method**- 4.11 General procedure for Monte Carlo method
- 4.12 Random emission from point source and diffusing surface
- 4.13 Monte Carlo reflection at a surface
### General

**5.1 Geometrical framework**- 5.11 Axes and coordinates
- 5.12 Direction cosines of the normal to a plane
- 5.13 Angle between two vectors
- 5.14 Distance and direction between two points
- 5.15 Interception of a ray and a plane
- 5.16 Test whether a point lies on a plane
- 5.17 Sides, internal angles and area of a spherical triangle
- 5.18 Subdivision of a spherical triangle
**5.2 Symbols and names of variables**

Go Back to Subtask C Introduction