The small element is perpendicular to the rectangle with its centre line
passing through the corner.

*Input*- Parameters
*X*&*Y*where

- as in diagram
*Equation**Note*- Angles are expressed in radians.

- The algorithm is another form of the equation for sky factor, algorithm 2.31
*Source*- Siegel(1)
**References**- 1. Siegel R and Howell J R
*Thermal Radiation Heat Transfer*(New York: McGraw Hill) (1972)

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