Page 27 - PowerPoint Presentation

EQUINOX- 22 ND SPETEMBER b. Consider 2ft overhang projection for this window. Calculate the height of the shadow on the
ALTITUDE- 75⁰ window at noon on equinox. (Hint: Use simple calculations, no software required)

HEIGHT OF SHADOW- 7 FEET
WINTER SOLISTICE- 21 ST DECEMBER LENGTH OF THE SHADOW ON THE GROUND- 0.5 FEET
ALTITUDE- 50⁰

Overhang projection = 2 feet

Solar altitude = 75⁰
Delhi (29N Lat, 77E Long). on 22 nd september

Sun tangent = tan ( solar altitude)

= tan ( 75⁰)
= 3.7

Length of the shadow = object height / sun
tangent

= 2 feet / 3.7
= 0.5 feet

Length of the shadow on ground is 0.5 feet

Height of the shadow is 7 feet.

1.60 feet depth of over- hang is
provide to block the equinox sun and

allow the winter sun for the south
facing facade.