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Measure the shadow

Be careful if you use this type of gnomon, don't forget " the b-shadow"

 

 

Ian's measure in Kaohsiung FXM

Height of gnomon : OG=50cm

Measured shadow : SC=13cm

Diameter of the base : b=7cm

Thickness of the stick : a=1cm

"hidden shadow":  CO=b/2 - a/2 = 3.5 - 0.5=3cm

"Total shadow": Measured shadow + "hidden shadow" = 13 + 3 = 16cm

 

 

 

 

 

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