Page 25 - PowerPoint Presentation
P. 25
Q.1 What is the length of the shadow cast by a 40 feet flag SUN PATH DIAGRAM FOR -:
pole at 2pm on 21st March, located in Delhi (29N Lat, 77E
Long). Solar altitude = 54 degrees (Hint: you don’t need to use
any software. This is just a simple geometry problem)
Height of the flag pole = 40 feet
Solar altitude = 54⁰ Delhi (29N Lat, 77E Long). 2pm
on 21st March
Sun tangent = tan ( solar altitude)
= tan ( 54⁰)
= 1.37
Length of the shadow = object height / sun
tangent • Time -2pm
= 40 feet / 1.37 • Date - 21st March,
= 29.19 feet •
Length of the shadow is 29.19 feet Location – Delhi
• Latitude – 29 degree N
• Longitude – 77 degree E
• Solar altitude = 54 degrees
